Fixed #10899 -- Ensured that log messages for deletions in the admin contain...

Fixed #10899 -- Ensured that log messages for deletions in the admin contain useful descriptions. Thanks to Jeremy Dunck for the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@10686 bcc190cf-cafb-0310-a4f2-bffc1f526a37