Update doc for congress
Update doc for congress

Change-Id: I9eb96be3606e657e9730abf6201ffc8a4ed9febd
Implements: blueprint enable-congress-container

coolsvap/kolla,intel-onp/kolla,intel-onp/kolla,mrangana/kolla,stackforge/kolla,dardelean/kolla-ansible,dardelean/kolla-ansible,mandre/kolla,mrangana/kolla,mandre/kolla,nihilifer/kolla,nihilifer/kolla,stackforge/kolla,stackforge/kolla,openstack/kolla,coolsvap/kolla,coolsvap/kolla,GalenMa/kolla,openstack/kolla,dardelean/kolla-ansible,mandre/kolla,rahulunair/kolla,rahulunair/kolla,GalenMa/kolla