missing '--set' in openstack-config command in "graceful_restart.md"

[pinggit]

the below commands seem to be wrong:

/usr/bin/openstack-config /etc/contrail/contrail-control.conf DEFAULT gr_helper_bgp_disable 1
/usr/bin/openstack-config /etc/contrail/contrail-control.conf DEFAULT gr_helper_xmpp_disable 1
service contrail-control restart

which should be

/usr/bin/openstack-config --set /etc/contrail/contrail-control.conf DEFAULT gr_helper_bgp_disable 1
/usr/bin/openstack-config --set /etc/contrail/contrail-control.conf DEFAULT gr_helper_xmpp_disable 1
service contrail-control restart