feat: injectTypes docs

[florian-lefebvre]

Description (required)

Docs for injectTypes and updates mentions of sync and env.d.ts

Related issues & labels (optional)

• Closes N/A
• Suggested label: minor-release

For Astro version: 4.14. See astro PR #11551.

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en	guides/integrations-guide/cloudflare.mdx	Source changed, localizations will be marked as outdated.
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en	guides/integrations-guide/vercel.mdx	Source changed, localizations will be marked as outdated.
en	guides/middleware.mdx	Source changed, localizations will be marked as outdated.
en	guides/typescript.mdx	Source changed, localizations will be marked as outdated.
en	install-and-setup.mdx	Source changed, localizations will be marked as outdated.
en	reference/cli-reference.mdx	Source changed, localizations will be marked as outdated.
en	reference/integrations-reference.mdx	Source changed, localizations will be marked as outdated.

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🔄️	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.

[sarah11918]

OK @florian-lefebvre , made a bunch of little commits! Can you please take a look at this to correct whatever is necessary for this all to make sense, including filling in the blank at line 427! 🙌