Fix broken reference links in Markdown content guide

[alfawal]

Description (required)

Fixed broken reference links in the English docs. I also did it for the other languages but reverted since its mentioned that I should edit one language at a time. Is it a PR per language or a commit per language?

[vercel]

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Name	Status	Preview	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	Jul 8, 2024 4:57am

[astrobot-houston]

Hello! Thank you for opening your first PR to Astro’s Docs! 🎉

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[astrobot-houston]

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Locale	File	Note
en	guides/markdown-content.mdx	Source changed, localizations will be marked as outdated.

Warnings reference

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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.

[delucis]

Thanks for the fix! Yes, we prefer to update the English on its own in general, and then leave updating other languages to our translators — appreciate the care you took reading those instructions 🙌