Fixed #15746. Clarified updated list_filter documentation.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@16010 bcc190cf-cafb-0310-a4f2-bffc1f526a37

docs/ref/contrib/admin/index.txt

@@ -531,17 +531,19 @@ subclass::
             list_display = ('username', 'email', 'first_name', 'last_name', 'is_staff')
             list_filter = ('is_staff', 'is_superuser')
 
-    Fields in ``list_filter`` can also span relations using the ``__`` lookup::
-
-        class UserAdminWithLookup(UserAdmin):
-            list_filter = ('groups__name')
-
     The above code results in an admin change list page that looks like this:
 
         .. image:: _images/users_changelist.png
 
     (This example also has ``search_fields`` defined. See below.)
 
+    .. versionadded:: 1.3
+
+    Fields in ``list_filter`` can also span relations using the ``__`` lookup::
+
+        class UserAdminWithLookup(UserAdmin):
+            list_filter = ('groups__name')
+
 .. attribute:: ModelAdmin.list_per_page
 
     Set ``list_per_page`` to control how many items appear on each paginated