Update tutorials to prefer newer provider plugins over min version

* Minimum versions of Terraform provider plugins are enforced in
each module already. Its better to provide examples with newer
versions. Some folks don't update them
* Previously, tutorials showed the minimum viable version of each
terraform provider that might be used

docs/cl/google-cloud.md

@@ -49,7 +49,7 @@ Configure the Google Cloud provider to use your service account key, project-id,
 
 ```tf
 provider "google" {
-  version = "2.0.0"
+  version = "~> 2.1.0"
   alias   = "default"
 
   credentials = "${file("~/.config/google-cloud/terraform.json")}"