Fix mistype in attach/detach usage
Fix mistype in attach/detach usage

Signed-off-by: Alexander Burluka <e1a296dbcd92383e62ed2d193750f7aed5ae3091@virtuozzo.com>

virtuozzo/ploop-flexvol,virtuozzo/ploop-flexvol,dmission/ploop-flexvol,dmission/ploop-flexvol