Fix typos and enhance description
Fix typos and enhance description

In section 'Adding Projects', 1) “demo.” below might need to
be changed to '“demo”.', 2) 'tenant-description' might be
better if changed to 'project-description'

Change-Id: Ib7a96c86ae95c95563aa51e9c4241103c922676e
Closes-bug: 1604670

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