More formatting examples, small rewordings

[joethei]

~ Adding callout examples as per https://forum.obsidian.md/t/add-callout-examples-with-colours-to-the-online-help/40725 ~ closing #266 by making the wording clearer and adding examples ~ closing #267 as the changes there are included in this PR

• More examples

Documenting some syntax that leads to questions in discord sometimes

• alternative heading syntax
• loose lists