[arch-design] Convert references to RST
[arch-design] Convert references to RST

Change-Id: I64d21d3583e60430c83dd7e9d5e7ca36955b2d41
Implements: blueprint archguide-mitaka-rst

openstack/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals