In the using-api-v2.rst document, various inconsistencies in spelling of
"openstackDemo", as well as the password under the "Creating Tenants" and
"Creating Users" sections.
Updated service names to adhere to the OpenStack service naming conventions.
Fixed capitalization of "Client" to "client".
Change-Id: Ib20782f5b05f7097158f606c6562f92126650b89
Closes-Bug: #1458015