[1.2.X] Fixed #14897 -- fixed some synax highlighting in the formset...

[1.2.X] Fixed #14897 -- fixed some synax highlighting in the formset documentation.  Thanks to marcusf for the patch.  Backport of [14912].

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@14913 bcc190cf-cafb-0310-a4f2-bffc1f526a37