Documentation/admin-guide/README.rst: add a label for cross-referencing

Add a label to the top of the file to allow cross-referencing.
Currently it's not possible to cross-reference this file from
Documentation/process/howto.rst because of the missing label.

Signed-off-by: Michael Rodin <michael-git@rodin.online>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>