New branch_protection_id attribute for gitlab_branch_protection

Author: armsnyder

docs/resources/branch_protection.md

@@ -2,7 +2,7 @@
 
 This resource allows you to protect a specific branch by an access level so that the user with less access level cannot Merge/Push to the branch.
 
--> **Note** The `allowed_to_push`, `allowed_to_merge` and `code_owner_approval_required` arguments require a GitLab Premium account or above.  Please refer to [Gitlab API documentation](https://docs.gitlab.com/ee/api/protected_branches.html) for further information.
+-> **NOTE**: The `allowed_to_push`, `allowed_to_merge` and `code_owner_approval_required` arguments require a GitLab Premium account or above.  Please refer to [Gitlab API documentation](https://docs.gitlab.com/ee/api/protected_branches.html) for further information.
 
 ## Example Usage