Merge branch 'docs-permissions-clarify-mpenna20190906' into 'master'

Docs: Clarified permissions of protected branches

See merge request gitlab-org/gitlab-ce!32785

doc/user/permissions.md

@@ -152,13 +152,9 @@ which visibility level you select on project settings.
 
 ### Protected branches
 
-To prevent people from messing with history or pushing code without
-review, we've created protected branches. Read through the documentation on
-[protected branches](project/protected_branches.md)
-to learn more.
-
-Additionally, you can allow or forbid users with Maintainer and/or
-Developer permissions to push to a protected branch. Read through the documentation on
+Additional restrictions can be applied on a per-branch basis with [protected branches](project/protected_branches.md).
+Additionally, you can customize permissions to allow or prevent project
+Maintainers and Developers from pushing to a protected branch. Read through the documentation on
 [Allowed to Merge and Allowed to Push settings](project/protected_branches.md#using-the-allowed-to-merge-and-allowed-to-push-settings)
 to learn more.