Updated Basic Usage of Transformation Functions

[nathanrboyer]

Documentation update related to #2866. This is a work in progress and my first pull request. Contributions welcome.

[bkamins]

@nathanrboyer - it is still a draft. Right?

[nathanrboyer]

Yes, sorry. I just picked up working on it again. I was hoping it wouldn't alert you yet. Should I avoid git push to my fork until I'm finished?

[bkamins]

No - pushing is OK. Then I will ignore changes in this PR until it is marked as ready for review. Thank you!

[nathanrboyer]

basics.md contains the only content changes.
notes.md contains questions I had while writing. The answers to some of these questions should be added to the documentation or to pull requests.
The other changed files should be discarded. I will need help figuring out the correct Git process to get this branch compatible again with master.
Feedback and reorganization welcome, thanks!

[bkamins]

I answered all your questions in notes.md.

What I think will be simplest for you is to create a new branch from current main and make a new PR (later we will close this one and just work on a new one). This will be least work on your side I think. In that new PR please include only the things that should be merged (and we can use this PR of discussion on things you want to ask)