[1.1.X] Fixed #13270 - typos in documentation

  
Thanks to cmbeelby for the report and patch

Backport of r12934 from trunk


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.1.X@12935 bcc190cf-cafb-0310-a4f2-bffc1f526a37