[1.2.X] Fixed #13350 - Documentation on autoescape should mention endautoescape

  
Thanks to mountainpaul@gmail.com for report and to dwillis for patch.

Backport of [13694] from trunk


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@13695 bcc190cf-cafb-0310-a4f2-bffc1f526a37