Document the Delete Merged Branches functionality

* Note that protected branches will not be part of the deletion

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+# Branches
+
+## Delete Merged Branches
+
+> [Introduced][ce-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 will be deleted as part of this operation.
+
+It's particularly useful to clean up old branches that were not deleting automatically when a Merge Request was merged. 
+
+---
+
+[ce-6449]: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6449 "Add button to delete all merged branches"
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