Comment 0 for bug 1880056

The is a erroneous grammar in explanatory notes in nova and its specific location is at "https://opendev.org/openstack/nova/src/branch/master/nova/compute/manager.py#L2983".

The note says "The volumes already detached during the above _shutdown_instance() call and this is why detach is not requested from _cleanup_volumes() in this case", but I think it should say "The volumes have already been detached during the above _shutdown_instance() call and this is why detach is not requested from _cleanup_volumes() in this case".