Fix broken link and add AppBinding scheme field (#16)

Fixes:
- stashed/stash#964
- stashed/stash#962

Author: suaas21

docs/mysql.md

@@ -21,7 +21,7 @@ Stash 0.9.0+ supports backup and restoration of MySQL databases. This guide will
 - At first, you need to have a Kubernetes cluster, and the `kubectl` command-line tool must be configured to communicate with your cluster. If you do not already have a cluster, you can create one by using Minikube.
 - Install Stash in your cluster following the steps [here](/docs/setup/install.md).
 - Install MySQL addon for Stash following the steps [here](/docs/addons/mysql/setup/install.md)
-- Install [KubeDB](https://kubedb.com) in your cluster following the steps [here](https://kubedb.com/docs/setup/install/). This step is optional. You can deploy your database using any method you want. We are using KubeDB because KubeDB simplifies many of the difficult or tedious management tasks of running a production grade databases on private and public clouds.
+- Install [KubeDB](https://kubedb.com) in your cluster following the steps [here](https://kubedb.com/docs/latest/setup/install/). This step is optional. You can deploy your database using any method you want. We are using KubeDB because KubeDB simplifies many of the difficult or tedious management tasks of running a production grade databases on private and public clouds.
 - If you are not familiar with how Stash backup and restore MySQL databases, please check the following guide [here](/docs/addons/mysql/overview.md).
 
 You have to be familiar with following custom resources:
@@ -173,6 +173,7 @@ spec:
     service:
       name: <my_database_service_name>
       port: <my_database_port_number>
+      scheme: mysql
   secret:
     name: <my_database_credentials_secret_name>
   # type field is optional. you can keep it empty.