[1.4.X] Fixed #18009 -- Cleaned up a comment about removal of the old...

[1.4.X] Fixed #18009 -- Cleaned up a comment about removal of the old contrib.syndication Feed class. Thanks Keryn Knight for the report.

Backport of r17866 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.4.X@17867 bcc190cf-cafb-0310-a4f2-bffc1f526a37