i18n(fr): update guides/pages

[HiDeoo]

Description

This PR updates the French version of the guides/pages page with the changes from #3033.

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Tracked Files

Locale	File	Note
fr	guides/pages.mdx	Localization changed, will be marked as complete. 🔄️

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.

[trueberryless]

I think we should translate the id property of the new AnchorHeading component, since the fragment of markdown headings in Starlight is automatically localized as well...