doc: Changes format style in ceph to improve readability as html.

Signed-off-by: Nilamdyuti Goswami <ngoswami@redhat.com>
doc: Adds updated man page for ceph under man/

Signed-off-by: Nilamdyuti Goswami <ngoswami@redhat.com>
Merge pull request #3201 from nilamdyuti/wip-doc-ceph

doc: Changes format style in ceph to improve readability as html.

Reviewed-by: John Wilkins <jowilkin@redhat.com>