[1.2.X] Fixed #15530 -- Corrected typo in template loader deprecation message....

[1.2.X] Fixed #15530 -- Corrected typo in template loader deprecation message. Thanks to msaelices for the report and patch.

Backport of r15714 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@15716 bcc190cf-cafb-0310-a4f2-bffc1f526a37