Update all Terraform guide w/ version info (#2615)

Author: leslitagordita

docs/applications/configuration-management/beginners-guide-to-terraform/index.md

@@ -32,6 +32,12 @@ The Linode provider relies on Linode's [APIv4](https://developers.linode.com/api
 
 The Linode provider can be used to create Linode instances, Images, domain records, Block Storage Volumes, StackScripts, and other resources. Terraform's [official Linode provider documentation](https://www.terraform.io/docs/providers/linode/index.html) details each resource that can be managed.
 
+{{< note >}}
+[Terraform’s Linode Provider](https://github.com/terraform-providers/terraform-provider-linode) has been updated and now requires Terraform version 0.12+.  To learn how to safely upgrade to Terraform version 0.12+, see [Terraform’s official documentation](https://www.terraform.io/upgrade-guides/0-12.html). View [Terraform v0.12’s changelog](https://github.com/hashicorp/terraform/blob/v0.12.0/CHANGELOG.md) for a full list of new features and version incompatibility notes.
+
+The examples in this guide were written to be compatible with [Terraform version 0.11](https://www.terraform.io/docs/configuration-0-11/terraform.html) and will be updated in the near future.
+{{</ note >}}
+
 ## Infrastructure as Code
 
 Terraform's representation of your resources in configuration files is referred to as *Infrastructure as Code* (IAC). The benefits of this methodology and of using Terraform include:

docs/applications/configuration-management/create-a-nodebalancer-with-terraform/index.md

@@ -34,6 +34,12 @@ If you would like to stop billing for the resources created in this guide, [remo
 
 1.  You should have Terraform installed in your development environment, and have a working knowledge of Terraform resource configuration and the [Linode provider](https://www.terraform.io/docs/providers/linode/index.html). For more information on how to install and use Terraform, check out our [Use Terraform to Provision Linode Environments](/docs/applications/configuration-management/how-to-build-your-infrastructure-using-terraform-and-linode/) guide.
 
+    {{< note >}}
+[Terraform’s Linode Provider](https://github.com/terraform-providers/terraform-provider-linode) has been updated and now requires Terraform version 0.12+.  To learn how to safely upgrade to Terraform version 0.12+, see [Terraform’s official documentation](https://www.terraform.io/upgrade-guides/0-12.html). View [Terraform v0.12’s changelog](https://github.com/hashicorp/terraform/blob/v0.12.0/CHANGELOG.md) for a full list of new features and version incompatibility notes.
+
+The examples in this guide were written to be compatible with [Terraform version 0.11](https://www.terraform.io/docs/configuration-0-11/terraform.html) and will be updated in the near future.
+    {{</ note >}}
+
 1.  Terraform requires an API access token. Follow the [Getting Started with the Linode API](/docs/platform/api/getting-started-with-the-linode-api-new-manager/#get-an-access-token) guide to obtain a token.
 
 1.  Create a `terraform_nodebalancer` directory on your computer for the Terraform project you will create in this guide. All files you create in this guide should be placed in this directory, and you should run all commands from this directory. This new project should not be created inside another Terraform project directory, including the one you may have made when previously following [Use Terraform to Provision Linode Environments](/docs/applications/configuration-management/how-to-build-your-infrastructure-using-terraform-and-linode/).

docs/applications/configuration-management/create-terraform-module/index.md

@@ -25,6 +25,12 @@ In this guide you will create a *Linode StackScripts* module. This module will d
 
 1. Install Terraform on your local computer using the steps found in the **Install Terraform** section of the [Use Terraform to Provision Linode Environments](https://linode.com/docs/applications/configuration-management/how-to-build-your-infrastructure-using-terraform-and-linode/#install-terraform) guide. Your Terraform project directory should be named `linode_stackscripts`.
 
+    {{< note >}}
+[Terraform’s Linode Provider](https://github.com/terraform-providers/terraform-provider-linode) has been updated and now requires Terraform version 0.12+.  To learn how to safely upgrade to Terraform version 0.12+, see [Terraform’s official documentation](https://www.terraform.io/upgrade-guides/0-12.html). View [Terraform v0.12’s changelog](https://github.com/hashicorp/terraform/blob/v0.12.0/CHANGELOG.md) for a full list of new features and version incompatibility notes.
+
+The examples in this guide were written to be compatible with [Terraform version 0.11](https://www.terraform.io/docs/configuration-0-11/terraform.html) and will be updated in the near future.
+    {{</ note >}}
+
 2. Terraform requires an API access token. Follow the [Getting Started with the Linode API](/docs/platform/api/getting-started-with-the-linode-api-new-manager/#get-an-access-token) guide to obtain a token.
 
 3. Complete the steps in the **Configure Git** section of the [Getting Started with Git](/docs/development/version-control/how-to-configure-git/#configure-git) guide.

docs/applications/configuration-management/deploy-a-wordpress-site-using-terraform-and-linode-stackscripts/index.md

@@ -31,6 +31,12 @@ Following this guide will result in the creation of [billable Linode resources](
 
 1.  Install Terraform on your computer by following the *Install Terraform* section of our [Use Terraform to Provision Linode Environments](/docs/applications/configuration-management/how-to-build-your-infrastructure-using-terraform-and-linode/#install-terraform) guide.
 
+    {{< note >}}
+[Terraform’s Linode Provider](https://github.com/terraform-providers/terraform-provider-linode) has been updated and now requires Terraform version 0.12+.  To learn how to safely upgrade to Terraform version 0.12+, see [Terraform’s official documentation](https://www.terraform.io/upgrade-guides/0-12.html). View [Terraform v0.12’s changelog](https://github.com/hashicorp/terraform/blob/v0.12.0/CHANGELOG.md) for a full list of new features and version incompatibility notes.
+
+The examples in this guide were written to be compatible with [Terraform version 0.11](https://www.terraform.io/docs/configuration-0-11/terraform.html) and will be updated in the near future.
+    {{</ note >}}
+
 1.  Terraform requires an API access token. Follow the [Getting Started with the Linode API](/docs/platform/api/getting-started-with-the-linode-api-new-manager/#get-an-access-token) guide to obtain one.
 
 1.  If you have not already, [assign Linode's name servers](/docs/platform/manager/dns-manager/#use-linode-s-name-servers-with-your-domain) to your domain at your domain name's registrar.

docs/applications/configuration-management/how-to-build-your-infrastructure-using-terraform-and-linode/index.md

@@ -45,7 +45,7 @@ Any Personal Access Tokens generated from the previous Linode Manager are API v3
 The installation steps in this section are for Linux operating systems. To install Terraform on a different operating system, like macOS, see [Terraform's downloads](https://www.terraform.io/downloads.html) page. Once installed, skip to [Building with the Terraform Provider](#building-with-the-linode-provider).
 
 {{< note >}}
-The Terraform Provider for Linode requires [Terraform version 0.12.0+](https://www.hashicorp.com/blog/announcing-terraform-0-12).
+The Terraform Provider for Linode requires [Terraform version 0.12.0+](https://www.hashicorp.com/blog/announcing-terraform-0-12). The examples in this guide were written to be compatible with [Terraform version 0.11](https://www.terraform.io/docs/configuration-0-11/terraform.html) and will be updated in the near future.
 {{</ note >}}
 
 1.  Make a Terraform project directory in your home directory and then navigate to it:

docs/applications/configuration-management/import-existing-infrastructure-to-terraform/index.md

@@ -19,6 +19,12 @@ external_resources:
 
 Terraform is an orchestration tool that uses declarative code to build, change, and version infrastructure that is made up of server instances and services. You can use [Linode's official Terraform provider](https://www.terraform.io/docs/providers/linode/index.html) to interact with Linode services. Existing Linode infrastructure can be imported and brought under Terraform management. This guide will describe how to import existing Linode infrastructure into Terraform using the official Linode provider plugin.
 
+{{< note >}}
+[Terraform’s Linode Provider](https://github.com/terraform-providers/terraform-provider-linode) has been updated and now requires Terraform version 0.12+.  To learn how to safely upgrade to Terraform version 0.12+, see [Terraform’s official documentation](https://www.terraform.io/upgrade-guides/0-12.html). View [Terraform v0.12’s changelog](https://github.com/hashicorp/terraform/blob/v0.12.0/CHANGELOG.md) for a full list of new features and version incompatibility notes.
+
+The examples in this guide were written to be compatible with [Terraform version 0.11](https://www.terraform.io/docs/configuration-0-11/terraform.html) and will be updated in the near future.
+{{</ note >}}
+
 ## Before You Begin
 
 1.  Terraform and the Linode Terraform provider should be installed in your development environment. You should also have a basic understanding of [Terraform resources](https://www.terraform.io/docs/configuration/resources.html). To install and learn about Terraform, read our [Use Terraform to Provision Linode Environments](/docs/applications/configuration-management/how-to-build-your-infrastructure-using-terraform-and-linode/) guide.

docs/applications/configuration-management/introduction-to-hcl/index.md

@@ -19,6 +19,12 @@ HCL is a configuration language authored by [HashiCorp](https://www.hashicorp.co
 
 This guide provides an introduction to HCL syntax and some commonly used HCL terminology.
 
+{{< note >}}
+[Terraform’s Linode Provider](https://github.com/terraform-providers/terraform-provider-linode) has been updated and now requires Terraform version 0.12+.  To learn how to safely upgrade to Terraform version 0.12+, see [Terraform’s official documentation](https://www.terraform.io/upgrade-guides/0-12.html). View [Terraform v0.12’s changelog](https://github.com/hashicorp/terraform/blob/v0.12.0/CHANGELOG.md) for a full list of new features and version incompatibility notes.
+
+The examples in this guide were written to be compatible with [Terraform version 0.11](https://www.terraform.io/docs/configuration-0-11/terraform.html) and will be updated in the near future.
+{{</ note >}}
+
 ## HCL Syntax Overview
 
 HashiCorp's configuration syntax is easy to read and write. It was created to have a more clearly visible and defined structure when compared with other well known configuration languages, like YAML.

docs/applications/configuration-management/secrets-management-with-terraform/index.md

@@ -22,6 +22,12 @@ external_resources:
 
 Terraform is an Infrastructure as Code (IaC) tool that allows you to write declarative code to manage your infrastructure. In order to implement IaC with Terraform it is necessary to supply secrets, such as server passwords and API tokens, within your code. This guide will discuss methods for securing those secrets within Terraform.
 
+{{< note >}}
+[Terraform’s Linode Provider](https://github.com/terraform-providers/terraform-provider-linode) has been updated and now requires Terraform version 0.12+.  To learn how to safely upgrade to Terraform version 0.12+, see [Terraform’s official documentation](https://www.terraform.io/upgrade-guides/0-12.html). View [Terraform v0.12’s changelog](https://github.com/hashicorp/terraform/blob/v0.12.0/CHANGELOG.md) for a full list of new features and version incompatibility notes.
+
+The examples in this guide were written to be compatible with [Terraform version 0.11](https://www.terraform.io/docs/configuration-0-11/terraform.html) and will be updated in the near future.
+{{</ note >}}
+
 ## Keeping Secrets Out of .tf Files
 
 In Terraform, `.tf` files contain the declarative code used to create, manage, and destroy infrastructure. This code is often committed to a version control system like Git, using a platform like GitHub, and shared within a team. Because it is easy for this information to become public-facing, it is important that you make sure your committed code is free of secrets.