ceph: update the note of OSD on LV-backed PVC
ceph: update the note of OSD on LV-backed PVC

The problem of OSD on LV-backed PVC can be mitigated with disabling
`lvmetad`.

Signed-off-by: Satoru Takeuchi <0be322b419f8cd46ee75447832ef0476dff222bc@gmail.com>

rook/rook,rook/nfs,rook/nfs,rook/rook,rook/nfs,rook/rook,rook/rook,rook/rook