docs: update VirtualItem interface with lane property and correct measureElement reference

[wo-o29]

🎯 Changes

• Added the missing lane property to the VirtualItem interface to match its description.
• Corrected the reference of the measureElement method from VirtualItem.measureElement to Virtualizer.measureElement in the documentation.
• Verified and referenced the actual implementation in packages/virtual-core/src/index.ts to ensure accuracy of the interface definition.

✅ Checklist

• [x] I have followed the steps listed in the Contributing guide.
• [x] I have tested and linted this code locally.
• [ ] I have generated a changeset for this PR, or this PR should not release a new version.

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Latest commit: 4ce2310b2fbf292ca35914659ced8999991f3441

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☁️ Nx Cloud last updated this comment at 2025-09-01 21:01:30 UTC

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commit: 4ce2310