i18n(fr): update content-loader-reference & astro-content

[ArmandPhilippot]

Description (required)

Adds changes from #13155 to the French translations of content-loader-reference.mdx and modules/astro-content.mdx.

Related issues & labels (optional)

• Suggested label: i18n

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Tracked Files

File	Note
fr/reference/content-loader-reference.mdx	Localization changed, will be marked as complete.
fr/reference/modules/astro-content.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.

[thomasbnt]

LGTM! 🥞