[1.1.X] Updated the docs to suggest using ``*args, **kwargs`` when...

[1.1.X] Updated the docs to suggest using ``*args, **kwargs`` when implementing model save methods. Thanks to Jeff Croft for the report.

Partial backport of r12118 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.1.X@12119 bcc190cf-cafb-0310-a4f2-bffc1f526a37