doc: Updates man page for ceph-disk.

Changes format style to improve readability as html.

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

Signed-off-by: Nilamdyuti Goswami <ngoswami@redhat.com>
doc: Updates man page for ceph-disk with suggested changes.

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

Signed-off-by: Nilamdyuti Goswami <ngoswami@redhat.com>
Merge pull request #3193 from nilamdyuti/wip-doc-ceph-disk

Changes format style in ceph-disk to improve readability as html

Reviewed-by: Loic Dachary <ldachary@redhat.com>