fix: use "set up" (verb) instead of "setup" (noun) in docs

[FrankFMY]

Fix incorrect use of "setup" (noun/adjective) where the verb form "set up" should be used:

• packages/kit/src/types/internal.d.ts: "Used to setup" → "Used to set up"
• documentation/docs/60-appendix/20-integrations.md: "to setup many different" → "to set up many different"
• documentation/docs/60-appendix/10-faq.md: "How to setup rewrites" → "How to set up rewrites"
• documentation/docs/30-advanced/70-packaging.md: "automatically setup" → "automatically set up" and "easier to setup tools" → "easier to set up tools"

[changeset-bot]

⚠️ No Changeset found

Latest commit: b5450f9

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[svelte-docs-bot]

Preview: https://svelte-dev-git-preview-kit-15262-svelte.vercel.app/

[teemingc]

We don't need a changeset because the type change is only internal

[teemingc]

Thanks