[1.2.X] Fixed #14232 -- Clarified the data type of date_list in date-based...

[1.2.X] Fixed #14232 -- Clarified the data type of date_list in date-based generic views. Thanks to clelland for the report and patch.

Backport of r14020 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@14028 bcc190cf-cafb-0310-a4f2-bffc1f526a37