Update docstrings

[GetPsyched]

Generally go over all of the docstrings once again to iron out any mistakes.

Some that I found are delete_chordmaps, append_starter_chordmaps, and append_functional_chordmaps mention committing but that's not relevant outside of VAR commands.

Ideally, these docstrings should be the same as the Serial API with a minimum amount of changes for any Python-specific documentation. However, there's no programmatic way to track deviations from it.