Ensure all Markdown files have consistent formatting:
* Lines are wrapped (makes git diffs easier to read/compare later)
* Use hashes consistently to mark headers (not 'underline' syntax)
* Use header levels (# -> ## -> ###) consistently
* Have at least one empty line before and after headers
* Bullet lists use wildcard and start directly without a space character
* Consistently use ```yaml and ```shell for correct syntax highlight
* Remove unnecessary newlines and indentation

This commit has *no changes* to the textual contents.