i18n(fr): update markdown-content, mdx and related files

[ArmandPhilippot]

Description (required)

Updates the French translations of guides/markdown-content.mdx and integrations-guide/mdx.mdx, as well as anchors and/or links in a few other files.

References

• Related to Clarify Markdown processors features and plugins #14297 and Update markdown-content.mdx #14400

[astrobot-houston]

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Tracked Files

File	Note
fr/guides/integrations-guide/mdx.mdx	Localization changed, will be marked as complete.
fr/guides/markdown-content.mdx	Localization changed, will be marked as complete. 🔄️
fr/guides/migrate-to-astro/index.mdx	Localization changed, will be marked as complete.
fr/guides/upgrade-to/v5.mdx	Localization changed, will be marked as complete.
fr/guides/upgrade-to/v7.mdx	Localization changed, will be marked as complete.
fr/recipes/external-links.mdx	Localization changed, will be marked as complete.
fr/recipes/modified-time.mdx	Localization changed, will be marked as complete.
fr/recipes/reading-time.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.

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[yanthomasdev]

LGTM! Good work! 🚀

[ArmandPhilippot]

Thanks, Yan! 💜 I was waiting to merge this one in case someone else wanted to review this given the huge diff... and it seems I also miss something in the English version: #14400 🤦🏽 I just pushed a commit to add those changes.