More install doc corrections
More install doc corrections

Change-Id: I69533c682d02ea57cb8f4bd1d6dc5530c6a32c72

openstack/designate,tonyli71/designate,kiall/designate-py3,ionrock/designate,cneill/designate,muraliselva10/designate,cneill/designate-testing,cneill/designate,kiall/designate-py3,cneill/designate-testing,cneill/designate,tonyli71/designate,cneill/designate-testing,grahamhayes/designate,melodous/designate,ramsateesh/designate,muraliselva10/designate,tonyli71/designate,grahamhayes/designate,richm/designate,ramsateesh/designate,richm/designate,ramsateesh/designate,melodous/designate,ionrock/designate,melodous/designate,ionrock/designate,cneill/designate,kiall/designate-py3,openstack/designate,grahamhayes/designate,NeCTAR-RC/designate,muraliselva10/designate,NeCTAR-RC/designate,openstack/designate,kiall/designate-py3,kiall/designate-py3,melodous/designate,cneill/designate