Fixed #14205 - Tiny grammar fix in form validation documentation
Fixed #14205 - Tiny grammar fix in form validation documentation

Thanks to zendak for report and patch.

--HG--
extra : convert_revision : svn%3Abcc190cf-cafb-0310-a4f2-bffc1f526a37/django/trunk%4013687

adieu/django-nonrel,adieu/django-nonrel,adieu/django-nonrel