chattr.1: improve attributes description to btrfs

- c: for btrfs, compression are conflicts with nodatacow and nodatasum
- C: for btrfs, nodatacow is conflict with compression

ref:
- https://btrfs.wiki.kernel.org/index.php/Manpage/btrfs(5)#MOUNT_OPTIONS
- https://www.spinics.net/lists/linux-btrfs/msg103219.html

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
1 file changed