Chore: Update spacing/indents/conventions

[mrseidel]

Need to go through all notes and update items based on PEP-8 (and other) conventions.

Help requested:
If you want to help with this, you can work through the examples and update these. Use a pull request when you complete whatever you want to complete.

Edit:
Creating sub-issues related to updating conventions/spacing/etc. per MDN Writing Guidelines for the JavaScript notes.

[mrseidel]

Note: This relates to Python notes only.

[mrseidel]

Main Python-related notes issue completed with #36. See sub-issue regarding the JavaScript notes.