Fixed #17269 -- Corrected the model options doc to indicate that, since 1.4,...

Fixed #17269 -- Corrected the model options doc to indicate that, since 1.4, all fields in `Meta.ordering` are honored by the admin. Thanks to sebastian for the report and patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@17130 bcc190cf-cafb-0310-a4f2-bffc1f526a37