Refactor reduce repo size content

doc/user/project/protected_branches.md

@@ -2,7 +2,7 @@
 type: reference, howto
 ---
 
-# Protected Branches
+# Protected branches
 
 [Permissions](../permissions.md) in GitLab are fundamentally defined around the
 idea of having read or write permission to the repository and branches. To impose

doc/user/project/protected_tags.md

@@ -2,13 +2,13 @@
 type: reference, howto
 ---
 
-# Protected Tags
+# Protected tags
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/10356) in GitLab 9.1.
 
-Protected Tags allow control over who has permission to create tags as well as preventing accidental update or deletion once created. Each rule allows you to match either an individual tag name, or use wildcards to control multiple tags at once.
+Protected tags allow control over who has permission to create tags as well as preventing accidental update or deletion once created. Each rule allows you to match either an individual tag name, or use wildcards to control multiple tags at once.
 
-This feature evolved out of [Protected Branches](protected_branches.md)
+This feature evolved out of [protected branches](protected_branches.md)
 
 ## Overview