Add link to configuration example for Ceph configuration from files.
Add link to configuration example for Ceph configuration from files.

Depends-On: I6093b4ae5da370affcae5f19b973d70f176795bb
Change-Id: Id47ea2239176184b6e518c23ad32c572de3a05bb

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