Fix/grammar file based

[REAPER2705]

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• For Astro version x.x.x

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[astrobot-houston]

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File	Note
en/guides/backend/firebase.mdx	Source changed, localizations will be marked as outdated.
en/reference/experimental-flags/client-prerender.mdx	Source changed, localizations will be marked as outdated.
en/reference/integrations-reference.mdx	Source changed, localizations will be marked as outdated.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]

Same as #14326

• Please fill our template PR
• Do not open two PRs containing the same changes. You can close the other one; for such small changes, I think a single PR is okay.