Merge branch 'docs-file-hooks-tier' into 'master'

Update tier badge for File hooks page

See merge request gitlab-org/gitlab!56585

doc/administration/file_hooks.md

@@ -5,7 +5,7 @@ info: "To determine the technical writer assigned to the Stage/Group associated
 type: reference
 ---
 
-# File hooks **(FREE)**
+# File hooks **(FREE SELF)**
 
 > - Introduced in GitLab 10.6.
 > - Until GitLab 12.8, the feature name was Plugins.