Point roles docs bugs to openstack-ansible LP
Point roles docs bugs to openstack-ansible LP

Currently when clicking on the small bug in the roles'
docs, we land on openstack-manuals launchpad.

This should solve it.

Change-Id: I31c26db797723892faf2b752acfc56d04dce5d54

openstack/openstack-ansible-galera_server,openstack/openstack-ansible-galera_server,os-cloud/openstack-ansible-galera_server,os-cloud/openstack-ansible-galera_server