Point twisted docs example to the code

docs/examples/twisted_example.rst

@@ -1,49 +1,5 @@
 Twisted Consumer Example
 ========================
-Example of writing a consumer using the :py:class:`Twisted connection adapter <pika.adapters.twisted_connection.TwistedProtocolConnection>`::
+Example of writing an application using the :py:class:`Twisted connection adapter <pika.adapters.twisted_connection.TwistedProtocolConnection>`::
 
-    # -*- coding:utf-8 -*-
-
-    import pika
-    from pika import exceptions
-    from pika.adapters import twisted_connection
-    from twisted.internet import defer, reactor, protocol,task
-
-
-    @defer.inlineCallbacks
-    def run(connection):
-
-        channel = yield connection.channel()
-
-        exchange = yield channel.exchange_declare(exchange='topic_link', exchange_type='topic')
-
-        queue = yield channel.queue_declare(queue='hello', auto_delete=False, exclusive=False)
-
-        yield channel.queue_bind(exchange='topic_link',queue='hello',routing_key='hello.world')
-
-        yield channel.basic_qos(prefetch_count=1)
-
-        queue_object, consumer_tag = yield channel.basic_consume('hello', auto_ack=False)
-
-        l = task.LoopingCall(read, queue_object)
-
-        l.start(0.01)
-
-
-    @defer.inlineCallbacks
-    def read(queue_object):
-
-        ch,method,properties,body = yield queue_object.get()
-
-        if body:
-            print(body)
-
-        yield ch.basic_ack(delivery_tag=method.delivery_tag)
-
-
-    parameters = pika.ConnectionParameters()
-    cc = protocol.ClientCreator(reactor, twisted_connection.TwistedProtocolConnection, parameters)
-    d = cc.connectTCP('hostname', 5672)
-    d.addCallback(lambda protocol: protocol.ready)
-    d.addCallback(run)
-    reactor.run()
+`Twisted Example <https://github.com/pika/pika/blob/master/examples/twisted_service.py>`_