fix docs to match new public cloud method

docs/infrastructure/aws_provision_vm.md

@@ -39,8 +39,8 @@ Coming Soon
 
 1. You will need to create programmatic access keys by following these [AWS Docs instructions](https://docs.aws.amazon.com/general/latest/gr/aws-sec-cred-types.html) See the section called "Programmatic access"
 
-2. Then set the aws_demo variable to True. As well as provide the folowing variable values before loading this demo as shown below.
- - aws_demo: True
+2. Then set the public_cloud variable to aws. As well as provide the folowing variable values before loading this demo as shown below.
+ - public_cloud: aws
  - my_access_key:
  - my_secret_key: 
 

docs/infrastructure/azure_mysql_server.md

@@ -39,8 +39,8 @@ Coming Soon
 
 1. You will need to create a Service Principal following these [Azure Docs instructions](https://docs.microsoft.com/en-us/azure/active-directory/develop/howto-create-service-principal-portal)
 
-2. Then set the azure_demo variable to True. As well as provide the folowing variable values before loading this demo as shown below.
- - azure_demo: True
+2. Then set the public_cloud variable to azure. As well as provide the folowing variable values before loading this demo as shown below.
+ - public_cloud: azure
  - my_subscription:
  - my_tenant: 
  - my_client: 

docs/infrastructure/azure_provision_vm.md

@@ -39,8 +39,8 @@ Coming Soon
 
 1. You will need to create a Service Principal following these [Azure Docs instructions](https://docs.microsoft.com/en-us/azure/active-directory/develop/howto-create-service-principal-portal)
 
-2. Then set the azure_demo variable to True. As well as provide the folowing variable values before loading this demo as shown below.
- - azure_demo: True
+2. Then set the public_cloud variable to azure. As well as provide the folowing variable values before loading this demo as shown below.
+ - public_cloud: azure
  - my_subscription:
  - my_tenant: 
  - my_client: