[ha-guide] Use newton title for install guide to replace mitaka
[ha-guide] Use newton title for install guide to replace mitaka

Since newton rename the Installation Guide to Installation Tutorials
and Guides, so this patch use the new name in High Availability Guide
for cleanup.

Change-Id: I9ad77c7439f04d3cbb3d9af987b1f6760342679b

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