Remove reference to CLI Ref in osc doc
Remove reference to CLI Ref in osc doc

Since we decide to unify the osc doc into the osc repo,
CLI Reference does not provide osc content.

Change-Id: I0d530143105b5411a7a38e9e9d2297a1e8c69071

dtroyer/python-openstackclient,openstack/python-openstackclient,dtroyer/python-openstackclient,openstack/python-openstackclient