Update Cinder guide
Update Cinder guide

Co-Authored-By: Serguei Bezverkhi <c33ca6227aebfb54a1e138877913c69b58e15edc@cisco.com>
partially-implements: blueprint documentation-rework
Depends-On: I2f709f8589fdbf62e3d0b265452fd58f413bee65
Change-Id: I19fe617b52b5b4a013f0a589ca21c0c932be4ad2

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