[1.1.X] Fixed #13202 -- Documented required libraries for markup template...

[1.1.X] Fixed #13202 -- Documented required libraries for markup template tags, based on patch from steveed.

Backport of r12860 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.1.X@12861 bcc190cf-cafb-0310-a4f2-bffc1f526a37