docs: update hydration mismatch link to React 18+ documentation (#10478)

Author: mlane

contributors.yml

@@ -480,6 +480,7 @@
 - mjackson
 - mjangir
 - mkrtchian
+- mlane
 - mochi-sann
 - mohammadhosseinbagheri
 - monitaure

docs/guides/migrating-react-router-app.md

@@ -699,7 +699,7 @@ Now then, go off and _remix your app_. We think you'll like what you build along
 [a-few-tweaks-to-improve-progressive-enhancement]: ../pages/philosophy#progressive-enhancement
 [routing-conventions]: ./routing
 [a-catch-all-route]: ../file-conventions/routes#splat-routes
-[hydration-mismatch]: https://reactjs.org/docs/react-dom.html#hydrate
+[hydration-mismatch]: https://react.dev/reference/react-dom/client/hydrateRoot
 [loader-data]: ../route/loader
 [client-only-component]: https://github.com/sergiodxa/remix-utils/blob/main/src/react/client-only.tsx
 [remix-utils]: https://www.npmjs.com/package/remix-utils