Use newton  config-reference link to replase liberty link
Use newton  config-reference link to replase liberty link

This patch fix the wrong liberty config-reference link and
remove the redundant comma.

Change-Id: I82e51d1d1f18fe11d9990f1d5cf0a1eaa96f6381

openstack/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals