Merge branch 'admin-doc-header-deduplication' into 'master'

It is confusing to have two administrator documentation sections.



See merge request !52

doc/README.md

@@ -53,14 +53,11 @@
 - [Welcome message](customization/welcome_message.md) Add a custom welcome message to the sign-in page.
 - [Reply by email](incoming_email/README.md) Allow users to comment on issues and merge requests by replying to notification emails.
 - [Migrate GitLab CI to CE/EE](migrate_ci_to_ce/README.md) Follow this guide to migrate your existing GitLab CI data to GitLab CE/EE.
-
-### Administrator documentation
-
-+ [User permissions](permissions/permissions.md)
-+ [API](api/README.md)
+- [User permissions](permissions/permissions.md)
+- [API](api/README.md)
 
 ## Contributor documentation
 
 - [Development](development/README.md) Explains the architecture and the guidelines for shell commands.
 - [Legal](legal/README.md) Contributor license agreements.
-- [Release](release/README.md) How to make the monthly and security releases.
+- [Release](release/README.md) How to make the monthly and security releases.
\ No newline at end of file