Fixed #16377 -- Fixed docs about how to disable the admin actions...

Fixed #16377 -- Fixed docs about how to disable the admin actions conditionally to match the current code. Thanks, Aymeric Augustin.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@16567 bcc190cf-cafb-0310-a4f2-bffc1f526a37