Fixed #14600 -- Added a versionchanged directive to the...

Fixed #14600 -- Added a versionchanged directive to the TEMPLATE_CONTEXT_PROCESSORS setting reference, and added a currentmodule directive to the staticfiles docs so that the crossref targets would point to the right place even with full paths in the staticfiles docs. Thanks to mathijs for the report and suggested text.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@14479 bcc190cf-cafb-0310-a4f2-bffc1f526a37