Fixed #11327 -- Added missing prefix in HTML id in admin-docs. Prefix...

Fixed #11327 -- Added missing prefix in HTML id in admin-docs. Prefix originally added in r10343, but missed the second usage. Thanks to Nathan for the report and patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@11096 bcc190cf-cafb-0310-a4f2-bffc1f526a37