[1.1.X] Fixed #13263 -- Corrected field name typo in queries documentation...

[1.1.X] Fixed #13263 -- Corrected field name typo in queries documentation examples.  Thanks, RicherPots for bug report and gabrielhurley for the patch.

Backport of r12926 from trunk


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.1.X@12927 bcc190cf-cafb-0310-a4f2-bffc1f526a37