docs: update hydration mismatch link to React 18+ documentation

[mlane]

🔗 docs: update hydration mismatch link to React 18+ documentation

Description

This PR updates the hydration mismatch reference in the Remix documentation, replacing the outdated link to the legacy React docs (legacy.reactjs.org) with the correct React 18+ documentation (react.dev/reference/react-dom/client/hydrateRoot).

Why?

• The old link points to deprecated React docs.
• React 18+ introduced hydrateRoot, which is the recommended approach for hydration.
• The new link provides up-to-date guidance on handling hydration in modern React applications.

Changes

• Updated link: legacy.reactjs.org/docs/react-dom.html#hydrate → react.dev/reference/react-dom/client/hydrateRoot

This ensures Remix users get the most accurate and relevant information when handling hydration mismatches. 🚀

[changeset-bot]

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Latest commit: 4d60d5d

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[remix-cla-bot]

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[remix-cla-bot]

Thank you for signing the Contributor License Agreement. Let's get this merged! 🥳