i18n(fr): update content-collections.mdx & modules/astro-content.mdx

[ArmandPhilippot]

Description (required)

• Adds changes from 5.0.0 beta docs #9240, fix: update a broken link in guides/content-collections.mdx #10143, fix: remove useless escape characters in pattern #10209 and fix: remove useless escape character in content-collections.mdx #10213 to the French translations of guides/content-collections.mdx and reference/modules/astro-content.mdx.
• Adds back the ReadMore in guides/markdown-content.mdx (see i18n(fr): update guides/markdown-content.mdx #10319 (comment))
• Adds back the link in integrations-guide/mdx.mdx (see i18n(fr): Update guides/integrations-guide/*from #9240 #10328)
• Fix malformed code snippet in integrations-guide/mdx.mdx (see fix: malformed code snippet in integrations-guide/mdx.mdx #10344)
• Adds missing update in the Unit 6-3 of the tutorial

Related issues & labels (optional)

• Suggested label: i18n

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Tracked Files

File	Note
fr/guides/cms/keystatic.mdx	Localization changed, will be marked as complete.
fr/guides/content-collections.mdx	Localization changed, will be marked as complete. 🔄️
fr/guides/integrations-guide/markdoc.mdx	Localization changed, will be marked as complete.
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/reference/modules/astro-content.mdx	Localization changed, will be marked as complete.
fr/tutorial/6-islands/3.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

[ArmandPhilippot]

Apply changes from #10209 and #10213 (the last one is not yet validated but... since this is the same thing I guess it's safe to apply it now)

[thomasbnt]

LGTM!