I haven't done anything about it because it's not a bug. If you have enough rep which was 3,500 you are able to make edits to any tutorial as we consider you a trusted member of the community.
I've increased it to 5,000 rep now, and because people have been vandalising other peoples tutorials I'm going to have to reconsider if this is a feature we can trust people with. It's a shame because it's going to take a lot of time to revert this feature which I'd rather spend elsewhere at the moment as I'm very busy.
If you have an issue with a feature you wish to bring to my attention please email me personally, I always check read and reply to all emails. Editing our most popular tutorial is not the way to go about it.