DOC: update tutorial docs
**N**itrogen Di-**O**xide

Do you have any others? If you, you can put them all in the same pr , no need to open multiple > Do you have any others? If you, you can put them all in the same pr , no need to open multiple

@MarcoGorelli Thanks for the info. For the moment that's all the typos I discovered so far. But I'm planning to work through the tutorial the next days. I'll  just kep pushing my suggestions to this PR.


 @eltenedor looking good. pls ping when ready. @eltenedor pls merge master and make a non-draft and can merge > @eltenedor pls merge master and make a non-draft and can merge

of course.  thanks @eltenedor 