add details on protected branches
Add some details from https://about.gitlab.com/2014/11/26/keeping-your-code-protected/:
Who can:
- Force push to non-protected branches
- Force push to protected branches
- Remove protected branches
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Add some details from https://about.gitlab.com/2014/11/26/keeping-your-code-protected/:
Who can: