[1.2.X] Fixed #14023 -- include non_field_errors in example. Thanks to konryd...

[1.2.X] Fixed #14023 -- include non_field_errors in example. Thanks to konryd for the report and patch.

Backport of r14041 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@14042 bcc190cf-cafb-0310-a4f2-bffc1f526a37