fonts: clarify preload

[florian-lefebvre]

Description (required)

Removes some preload recommendations to avoid risking over preloading.

Related issues & labels (optional)

• <Font preload /> generates excessive preload links astro#15841
• Suggested label:

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en/guides/fonts.mdx	Source changed, localizations will be marked as outdated.
en/reference/modules/astro-assets.mdx	Source changed, localizations will be marked as outdated.

Warnings reference

Icon	Description
🔄️	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.

[ArmandPhilippot]

I think that makes sense, LGTM!