btrfs: add comment about metadata_uuid in btrfs_fs_devices

Add comment about metadata_uuid in btrfs_fs_devices.
No functional change.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain 2023-05-24 20:02:38 +08:00 • committed by David Sterba
commit f62c302e6d