doc: Diagram updates from feedback.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>
doc: Diagram update from feedback.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>
doc: Diagram update and clarification on ceph-deploy admin results.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>