[1.1.X] Fixed #13051 -- Corrected the documentation of URL namespacing to...

[1.1.X] Fixed #13051 -- Corrected the documentation of URL namespacing to match the tested implementation behavior. Thanks to apollo13 for the report, and Gabriel Hurley for the patch.

Backport of r13161 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.1.X@13164 bcc190cf-cafb-0310-a4f2-bffc1f526a37