docs: update the large-form example to work with async validators

[fulopkovacs]

🎯 Changes

The form composition API (React Large Form) was confusing, because an onChange validator was defined in the main form, not in the formOptions, which was misleading, because if you try to add async validators there, TypeScript will complain about the form passed down through the child form's props (see this StackBlitz box).

✅ Checklist

• I have followed the steps in the Contributing guide.
• I have tested this code locally with pnpm 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: dee85ff

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☁️ Nx Cloud last updated this comment at 2025-09-28 19:01:01 UTC

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commit: dee85ff