Fixed #14905 -- Corrected some misleading linking and language in the...

Fixed #14905 -- Corrected some misleading linking and language in the FileField docs. Thanks to Keryn Knight for the report and draft patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15088 bcc190cf-cafb-0310-a4f2-bffc1f526a37