Fixed #5544 -- Fixed typo in documentation, introduced as a result of the...

Fixed #5544 -- Fixed typo in documentation, introduced as a result of the changes in [6333] and [6365]. Thanks for the report, xiaolianyi@gmail.com.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@6377 bcc190cf-cafb-0310-a4f2-bffc1f526a37