nvme: remove a misleading comment on struct nvme_ns

While a NVMe Namespace is somewhat similar to a SCSI Logical Unit (and not
a Logical Unit Number anyway) there are subtile differences.  Remove the
misleading comment.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grmberg.me>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/nvme/host/nvme.h

@@ -182,9 +182,6 @@ struct nvme_ctrl {
 	struct nvmf_ctrl_options *opts;
 };
 
-/*
- * An NVM Express namespace is equivalent to a SCSI LUN
- */
 struct nvme_ns {
 	struct list_head list;