ceph: fix manifest ceph version support comment
ceph: fix manifest ceph version support comment

Adjust the comment for `cephVersion:allowUnsupported` in the
`cluster.yaml` manifest to correctly document that Nautilus and
Octopus are supported (not Mimic and Nautilus).

Signed-off-by: Blaine Gardner <135b86f2968bdbcc730c10d8ababd343bb675986@suse.com>

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