Fixed typo in template docs -- Thanks, Nicholas Riley and Robin Munn!

git-svn-id: http://code.djangoproject.com/svn/django/trunk@145 bcc190cf-cafb-0310-a4f2-bffc1f526a37

docs/templates.txt

@@ -309,7 +309,7 @@ Built-in tag reference
     See `Template inheritance`_ for more information.
 
 ``filter``
-    Filter the contents of the blog through variable filters.
+    Filter the contents of the variable through variable filters.
 
     Filters can also be piped through each other, and they can have arguments --
     just like in variable syntax.