Dear Richard,
Hello! Welcome to the Microsoft Community. I'm glad to be able to assist you. If I misunderstand your question, please let me know promptly.
I understand that you have found a spelling mistake. Thank you very much for your feedback. You are really a careful person! This seems to be the negligence of web developers. I see what you mean. It should be "on", not "non", right? But unfortunately, like you, I am a user of the Microsoft community, and we can't contact the development team to make changes. But fortunately, its influence is not particularly great, and its original meaning can still be understood.
You may be able to give feedback in the feedback center, which has a chance for developers to see and change it.
I hope the above information can be of help to you. If you try the solution, please feel free to tell me the results or the problems you encounter.
Best Wishes
Pyked | Microsoft Community Support Specialist