Serialization doc: usage of get_serializer()

[haavikko@…]

At end of document ​http://www.djangoproject.com/documentation/serialization/
there is example:

json_serializer = serializers.get_serializer("json")
json_serializer.serialize(queryset, ensure_ascii=False, stream=response)

serializers.get_serializer() returns a class object, not actual serializer instance.
The call to json_serializer.serialize fails with:

TypeError: unbound method serialize() must be called with Serializer instance as first argument (got QuerySet instance instead)

[Vinay Sajip <vinay_sajip@…>]

Patch for serialization documentation error

[Malcolm Tredinnick]

(In [5165]) Fixed #4042 -- Fixed typo in serialization example. Thanks, Vinay Sajip.