ceph: fix cluster.yaml example
ceph: fix cluster.yaml example

Uncomment the `cleanupPolicy:` so that the file can be injected.

Closes: https://github.com/rook/rook/issues/6762
Signed-off-by: Sébastien Han <62d754cc350e84d3b1c32ae79f976f5348e74a40@redhat.com>

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