docs/installation/google: remove -mtu flag

docs/sources/installation/google.rst

@@ -50,18 +50,9 @@
     docker-playground:~$ curl get.docker.io | bash
     docker-playground:~$ sudo update-rc.d docker defaults
 
-6. If running in zones: ``us-central1-a``, ``europe-west1-1``, and ``europe-west1-b``, the docker daemon must be started with the ``-mtu`` flag. Without the flag, you may experience intermittent network pauses. 
-`See this issue <https://code.google.com/p/google-compute-engine/issues/detail?id=57>`_ for more details.
-
-.. code-block:: bash
-
-    docker-playground:~$ echo 'DOCKER_OPTS="$DOCKER_OPTS -mtu 1460"' | sudo tee -a /etc/default/docker
-    docker-playground:~$ sudo service docker restart
-
-7. Start a new container:
+6. Start a new container:
 
 .. code-block:: bash
 
     docker-playground:~$ sudo docker run busybox echo 'docker on GCE \o/'
     docker on GCE \o/
-