Merge branch 'patch-28' into 'master'

Fix link in doc/user/project/repository/branches/index.md

See merge request gitlab-org/gitlab-ce!22554

doc/user/project/repository/branches/index.md

@@ -30,12 +30,12 @@ to learn more.
 
 ## Delete merged branches
 
-> [Introduced][ce-6449] in GitLab 8.14.
+> [Introduced](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6449) in GitLab 8.14.
 
 ![Delete merged branches](img/delete_merged_branches.png)
 
 This feature allows merged branches to be deleted in bulk. Only branches that
-have been merged and [are not protected][protected] will be deleted as part of
+have been merged and [are not protected](../../protected_branches.md) will be deleted as part of
 this operation.
 
 It's particularly useful to clean up old branches that were not deleted
@@ -44,7 +44,7 @@ automatically when a merge request was merged.
 
 ## Branch filter search box
 
-> [Introduced][https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/22166] in GitLab 11.5.
+> [Introduced](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/22166) in GitLab 11.5.
 
 ![Branch filter search box](img/branch_filter_search_box.png)
 
@@ -57,6 +57,3 @@ Sometimes when you have hundreds of branches you may want a more flexible matchi
 
 - `^feature` will only match branch names that begin with 'feature'.
 - `feature$` will only match branch names that end with 'feature'.
-
-[ce-6449]: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6449 "Add button to delete all merged branches"
-[protected]: ../../protected_branches.md