[v3] Update Markdown files to latest spec#111

Merged

iHiD merged 2 commits intoexercism:mainfrom ErikSchierboom:update-markdown-files

May 4, 2021

+15-3

Commits on Feb 12, 2021

[v3] Add level one headings to Markdown files.
ErikSchierboom
committed
[v3] Markdown sub-headings must be parent level incremented by one.
ErikSchierboom
committed