docs: document .htm support

[Punisheroot]

Summary

• update the Language support page to document that Biome recognizes both .html and .htm files as HTML, following the support introduced in feat(html): support .htm files biome#11126

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[coderabbitai]

Walkthrough

The language support documentation now states that Biome recognises .html and .htm file extensions as HTML.

Suggested reviewers: ematipico

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely reflects the change: documenting .htm support in the docs.
Description check	✅ Passed	The description matches the documented .html and .htm support change.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[ematipico]

Shouldn't this go below the HTML paragraph?

[dyc3]

There isn't a specific html section. there's stuff about super languages, but not base html

[dyc3]

This is fine, I'll fix it up. I saw some other things on the language support page that need updating, so I'll take care of it.