It should show how to get your own version of this path: /dev/disk/by-id/scsi-0DO_example
I.e. please update that tutorial to show how to get your /dev/disk/by-id volume identifier.
I now know how to get it (I found the path in the volume config instructions - i.e. the button next to "take snapshot"), so please do not interpret this post as a question. I'd like the tutorial to get updated so it doesn't confuse others in the future.