update(transformers): general clean up & improvment

[ajweeks]

This change fixes typos, unifies variable naming, and improves wording of several sections.

Note that I wasn't able to get the scripts (nor precommit hooks) running on Windows so I have edited each file manually.

[ddorn]

Thanks for going through the notebook and fixing so many small things. I've added a few comments, because I think a few things can be improved.
You can resolve the comments once you're done, and leave me a message for those you don't agree with and then I'll merge ;)

Also I might have fixed the bug on master that prevented you from running the pre-commit, so you should pull and try again! (so that you don't have to copy paste painfully all your changes...)

[ajweeks]

Updated with your feedback!

[ajweeks]

How are fixes normally propagated to the arena notebook?

[ddorn]

How are fixes normally propagated to the arena notebook?

They aren't, we provide it mostly as-is. I don't think you should propagate them, it's not worth it.

[ajweeks]

Great, then I think this is ready for merging now :)