MountFlags=shared missing in ubuntu service file for docs

It was reported that the multinode getting started docs for kolla didn't report the need to set the MountFlags=shared for the ubuntu service file. Further inspection of the docs confirmed the omission.

http://docs.openstack.org/developer/kolla/multinode.html

IRC logs:
<pron> emm i belive we have an error here http://docs.openstack.org/developer/kolla/multinode.html
<inc0> whats that pron ?
<pron> MountFlags=shared missing in ubuntu service file
<pron> i think at least , since i am trying to play with kolla atm

Docs excerpt:
# CentOS
[Service]
MountFlags=shared
EnvironmentFile=/etc/sysconfig/docker
ExecStart=/usr/bin/docker daemon $INSECURE_REGISTRY

# Ubuntu
[Service]
EnvironmentFile=-/etc/default/docker
ExecStart=/usr/bin/docker daemon -H fd:// $DOCKER_OPTS