document ththat one should use defer instead of values with queysets and DjangoObjectTypes

docs/queries.rst

@@ -282,6 +282,13 @@ of Django's ``HTTPRequest`` in your resolve methods, such as checking for authen
             return Question.objects.none()
 
 
+DjangoObjectTypes
+~~~~~~~~~~~~~~~~~
+
+A Resolver that maps to a defined `DjangoObjectType` should only use methods that return a queryset.
+Queryset methods like `values` will return dictionaries, use `defer` instead.
+
+
 Plain ObjectTypes
 -----------------