Doc fix: "keystone-manage upgrade" is not a thing
Doc fix: "keystone-manage upgrade" is not a thing

This was part of Henry's initial patch, which ended up just being part
of db_sync instead.

Change-Id: Ibbfec6d665e59a0195a425f75a108819d42a946d

ilay09/keystone,mahak/keystone,rajalokan/keystone,ilay09/keystone,openstack/keystone,mahak/keystone,ilay09/keystone,mahak/keystone,openstack/keystone,rajalokan/keystone,rajalokan/keystone,openstack/keystone