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markdown: explicitly forbid setext headings

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Assessment

Difficulty
1/5
Estimated time
Under an hour
Newbie friendliness
35/100
Issue type
Documentation
Clarity
Clearly specified
Activity status
Stale
Tech stack
markdown
Domain
documentation

Research direction

Open building/markdown/markdown.md at the referenced lines 9–15 and review how the current heading guidance is phrased. Update the specification to explicitly forbid setext headings while retaining the ATX guidance and linked references; the documentation should clearly state that only ATX headings are allowed.

Written by the indexing model from the issue text.

Description

Exercism's markdown spec talks only about ATX headings, but doesn't quite explicitly say "don't use setext headings"
https://github.com/exercism/docs/blob/d334042e8f54ba7dd24ad215648355ff7795359a/building/markdown/markdown.md#L9-L15

It does however say:

MD003: Use atx style

So markdown linting in the future will enforce this.

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Forks
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Avg merge
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Merged PRs (30d)
4

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