docs: fix tanstack router useHref example

[kveperedo]

In the integration of the tanstack-router package in the docs, the router.buildLocation should accept an object instead in order for client-side routing to work as expected.

Reference:
https://github.com/TanStack/router/blob/main/packages/react-router/src/RouterProvider.tsx#L49

✅ Pull Request Checklist:

• Included link to corresponding React Spectrum GitHub Issue.
• Added/updated unit tests and storybook for this change (for new code or code which already has tests).
• Filled out test instructions.
• Updated documentation (if it already exists for this component).
• Looked at the Accessibility Practices for this feature - Aria Practices

📝 Test Instructions:

🧢 Your Project:

[reidbarber]

Thanks for this!

[yihuiliao]

thanks for the pr!