[v3] Markdown sub-headings must be parent level incremented by one.
[v3] Markdown sub-headings must be parent level incremented by one.

The full specification can be found [here](https://github.com/exercism/docs/blob/main/contributing/standards/markdown.md).

exercism/xpascal,rpottsoh/exercism-delphi,exercism/xdelphi