[Documentation]: Add remaining best practice summaries for checks

[CodyCBakerPhD]

What would you like changed or added to the documentation and why?

For a while now we've had 3 check functions link their best practices to an orphaned page (so that the links resolved without error): https://github.com/NeurodataWithoutBorders/nwbinspector/blob/dev/docs/best_practices/todo.rst

#501 removes that page and codes the best practices for those checks as explicitly 'TODO'

So someone should write a quick blurb about why those 3 checks are important

1. https://github.com/NeurodataWithoutBorders/nwbinspector/pull/501/files#diff-613ecf43f4cc65aa2a2344c2074185a5c4a9a1eb32db3831b9dfa08df559c14eR56
2. https://github.com/NeurodataWithoutBorders/nwbinspector/pull/501/files#diff-2f35eee2f078c767ada736ec7ee7860784b215294c67b88bd8c00a6a04884c1bR13
3. https://github.com/NeurodataWithoutBorders/nwbinspector/pull/501/files#diff-0386a46bb72e66397ac6c0f1e34e341a666964d163c51171560a69b94ccc211eR48

Do you have any interest in helping write or edit the documentation?

Yes.

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