Fixes: AIO Quickstart docs ceph reference
Fixes: AIO Quickstart docs ceph reference

Adds missing '_ceph' element to the example SCENARIO.

Change-Id: Icf2c7c8c7faad2da369319ab2d2c7c250506164d

stackforge/os-ansible-deployment,stackforge/os-ansible-deployment,openstack/openstack-ansible,openstack/openstack-ansible