Markdown code blocks part 2; migrate Nim Manual (#20080)

* Change headings underscored by `~~~` to `###`

* Markdown code blocks part 2; migrate Nim Manual
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Andrey Makarov 2022-07-25 19:29:52 +03:00 • committed by GitHub
commit 62b81d7f10
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7 changed files with 881 additions and 670 deletions

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