Update google_sql_user documentation for IAM Group authentication for…

… Postgres (GoogleCloudPlatform#11980)

mmv1/third_party/terraform/website/docs/r/sql_user.html.markdown

@@ -119,9 +119,10 @@ The following arguments are supported:
 
 * `type` - (Optional) The user type. It determines the method to authenticate the
     user during login. The default is the database's built-in user type. Flags
-    include "BUILT_IN", "CLOUD_IAM_USER", and "CLOUD_IAM_SERVICE_ACCOUNT" for both 
-    [Postgres](https://cloud.google.com/sql/docs/postgres/admin-api/rest/v1beta4/users#sqlusertype) and [MySQL](https://cloud.google.com/sql/docs/mysql/admin-api/rest/v1beta4/users#sqlusertype).
-    MySQL also includes "CLOUD_IAM_GROUP", "CLOUD_IAM_GROUP_USER" and "CLOUD_IAM_GROUP_SERVICE_ACCOUNT".
+    include "BUILT_IN", "CLOUD_IAM_USER", "CLOUD_IAM_SERVICE_ACCOUNT", "CLOUD_IAM_GROUP",
+    "CLOUD_IAM_GROUP_USER" and "CLOUD_IAM_GROUP_SERVICE_ACCOUNT" for
+    [Postgres](https://cloud.google.com/sql/docs/postgres/admin-api/rest/v1beta4/users#sqlusertype)
+    and [MySQL](https://cloud.google.com/sql/docs/mysql/admin-api/rest/v1beta4/users#sqlusertype).
 
 * `deletion_policy` - (Optional) The deletion policy for the user.
     Setting `ABANDON` allows the resource to be abandoned rather than deleted. This is useful