Fix typos in the readmes and update examples

A few minor improvements

Signed-off-by: Tim Smith <tsmith@chef.io>

lib/chef-cli/skeletons/code_generator/files/default/build_cookbook/README.md

@@ -101,7 +101,7 @@ cd .delivery/build_cookbook
 kitchen converge
 ```
 
-This will take awhile because it will now pass on the first VM, and then create the second VM. We should have warned you this was a good time for a coffee break.
+This will take a while because it will now pass on the first VM, and then create the second VM. We should have warned you this was a good time for a coffee break.
 
 ```
 Recipe: test::default
@@ -115,7 +115,7 @@ Recipe: test::default
 Running handlers:
 Running handlers complete
 Chef Infra Client finished, 3/32 resources updated in 54.665445968 seconds
-Finished converging <default-centos-71> (1m26.83s).
+Finished converging <default-centos-8> (1m26.83s).
 ```
 
 Victory is ours! Our verify phase passed on the build nodes.
@@ -129,7 +129,7 @@ delivery review
 
 ## FAQ
 
-### Why don't I just run rspec and foodcritic/cookstyle on my local system?
+### Why don't I just run rspec and cookstyle on my local system?
 
 An objection to the Test Kitchen approach is that it is much faster to run the unit, lint, and syntax commands for the project on the local system. That is totally true, and also totally valid. Do that for the really fast feedback loop. However, the dance we do with Test Kitchen brings a much higher degree of confidence in the changes we're making, that everything will run on the build nodes in Chef Workflow. We strongly encourage this approach before actually pushing the changes to Workflow.
 

lib/chef-cli/skeletons/code_generator/files/default/chefignore

@@ -97,7 +97,7 @@ Gemfile.lock
 Policyfile.rb
 Policyfile.lock.json
 
-# Cookbooks #
+# Documentation #
 #############
 CHANGELOG*
 CONTRIBUTING*

lib/chef-cli/skeletons/code_generator/files/default/cookbook_readmes/README-policy.md

@@ -1,4 +1,4 @@
-This directory typically contains Chef cookbooks. This repository was
+This directory typically contains Chef Infra cookbooks. This repository was
 generated with the '--policy-only' option, which means you have chosen
 to use a workflow where each cookbook is treated as an independent
 software project. As a result, any cookbooks present in this directory

lib/chef-cli/skeletons/code_generator/files/default/cookbook_readmes/README.md

@@ -1,4 +1,4 @@
-This directory contains the cookbooks used to configure systems in your infrastructure with Chef - an example basic cookbook called `example` has been automatically created for you.
+This directory contains the cookbooks used to configure systems in your infrastructure with Chef Infra - an example basic cookbook called `example` has been automatically created for you.
 
 Knife needs to be configured to know where the cookbooks are located with the `cookbook_path` setting. If this is not set, then several cookbook operations will fail to work properly.
 
@@ -23,7 +23,7 @@ cookbook_email     "cookbooks@example.com"
 cookbook_license   "apachev2"
 ```
 
-Supported values for `cookbook_license` are "apachev2", "mit","gplv2","gplv3", or "none". These settings are used to prefill comments in the default recipe, and the corresponding values in the metadata.rb. You are free to change the the comments in those files.
+Supported values for `cookbook_license` are "apachev2", "mit","gplv2","gplv3", or "none". These settings are used to prefill comments in the default recipe, and the corresponding values in the metadata.rb. You are free to change the comments in those files.
 
 Create new cookbooks in this directory with Chef.
 

lib/chef-cli/skeletons/code_generator/files/default/repo/cookbooks/example/README.md

@@ -4,11 +4,11 @@ An example cookbook
 
 ## Requirements
 
-### Platforms:
+### Platforms
 
 _No platforms defined_
 
-### Cookbooks:
+### Cookbooks
 
 _No dependencies defined_
 

lib/chef-cli/skeletons/code_generator/templates/default/kitchen.yml.erb

@@ -26,7 +26,7 @@ verifier:
 
 platforms:
   - name: ubuntu-18.04
-  - name: centos-7
+  - name: centos-8
 
 suites:
   - name: default

lib/chef-cli/skeletons/code_generator/templates/default/kitchen_dokken.yml.erb

@@ -21,9 +21,9 @@ platforms:
       intermediate_instructions:
         - RUN /usr/bin/apt-get update
 
-  - name: centos-7
+  - name: centos-8
     driver:
-      image: dokken/centos-7
+      image: dokken/centos-8
       pid_one_command: /usr/lib/systemd/systemd
 
 suites:

lib/chef-cli/skeletons/code_generator/templates/default/kitchen_policyfile.yml.erb

@@ -22,7 +22,7 @@ verifier:
 
 platforms:
   - name: ubuntu-18.04
-  - name: centos-7
+  - name: centos-8
 
 suites:
   - name: default

spec/unit/command/generator_commands/cookbook_spec.rb

@@ -580,7 +580,7 @@ def with_argv(argv)
 
             platforms:
               - name: ubuntu-18.04
-              - name: centos-7
+              - name: centos-8
 
             suites:
               - name: default
@@ -667,7 +667,7 @@ def with_argv(argv)
 
             platforms:
               - name: ubuntu-18.04
-              - name: centos-7
+              - name: centos-8
 
             suites:
               - name: default