feat(fonts): add note about google options

[florian-lefebvre]

Description (required)

Adds a note about google options

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For Astro version: 5.7.5. See astro PR: withastro/astro#13654

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en/reference/experimental-flags/fonts.mdx	Source changed, localizations will be marked as outdated.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.

[sarah11918]

I think that looks great! Merge when ready! 🫡