clientIF: update doctext to inclode json-rpc

Change-Id: If4cb2eb8fb6ec8b7c8498342c5b47a9c16f9c61c
Signed-off-by: Yeela Kaplan <ykaplan@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/36271
Reviewed-by: Dan Kenigsberg <danken@redhat.com>