docs: clarify getItemKey memoization requirement and useAnimationFrameWithResizeObserver option

[piecyk]

🎯 Changes

This PR updates documentation for two Virtualizer options:

• getItemKey
• useAnimationFrameWithResizeObserver

✅ Checklist

• I have followed the steps in the Contributing guide.
• I have tested this code locally with pnpm run test:pr.

🚀 Release Impact

• This change affects published code, and I have generated a changeset.
• This change is docs/CI/dev-only (no release).

[changeset-bot]

⚠️ No Changeset found

Latest commit: cc3ef71

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---

☁️ Nx Cloud last updated this comment at 2026-01-02 16:17:51 UTC

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commit: cc3ef71