[1.4.X] Fixed #18095 -- Added missing 'cc' mention in EmailMessage...

[1.4.X] Fixed #18095 -- Added missing 'cc' mention in EmailMessage recipients() description. Thanks Stéphane Raimbault for the report and the patch.

Backport of r17891 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.4.X@17892 bcc190cf-cafb-0310-a4f2-bffc1f526a37