docs: clarify the state of HTML language support

[Azarattum]

Summary

Discussed here biomejs/biome#4726 (comment)

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en	src/content/docs/internals/language-support.mdx	Source changed, localizations will be marked as outdated.

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🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

[coderabbitai]

Walkthrough

Documentation update to the language support page clarifying that HTML support requires explicit opt-in. The change adds an asterisk marker to "HTML" in the support table, accompanied by a footnote explaining the opt-in requirement with a link to the HTML configuration documentation.

Suggested labels

A-Documentation

Suggested reviewers

• ematipico

Pre-merge checks and finishing touches

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately reflects the main change: clarifying HTML language support status in documentation.
Description check	✅ Passed	The description references a related discussion but lacks detail about what the documentation changes actually accomplish.

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[coderabbitai]

Actionable comments posted: 1

🧹 Nitpick comments (1)

src/content/docs/internals/language-support.mdx (1)

20-20: Nit: keep the table cell spacing consistent (and consider linking “HTML” like the other languages).
Line 20 has slightly odd spacing, and “HTML” is now the only unlinked language name in the table. Not a blocker—just a tidy-up suggestion.

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📥 Commits

Reviewing files that changed from the base of the PR and between dcaccf0 and 2a251f6.

📒 Files selected for processing (1)

• src/content/docs/internals/language-support.mdx (2 hunks)

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• GitHub Check: Redirect rules - biomejs
• GitHub Check: Header rules - biomejs
• GitHub Check: Pages changed - biomejs