docs(rsc): clarify React Router example is less official setup

Add note that this example represents a custom integration that predates
React Router's official RSC support. Keep example for posterity and as
an alternative approach while acknowledging the official implementation.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: hi-ogawa

packages/plugin-rsc/README.md

@@ -22,7 +22,7 @@ npx degit vitejs/vite-plugin-react/packages/plugin-rsc/examples/starter my-app
 - [`./examples/starter`](./examples/starter)
   - This example provides an in-depth overview of API with inline comments to explain how they function within RSC-powered React application.
 - [`./examples/react-router`](./examples/react-router)
-  - This demonstrates how to integrate [React Router RSC](https://reactrouter.com/how-to/react-server-components) with this plugin.
+  - This demonstrates a custom integration of React Router with RSC using this plugin. Note that React Router now provides [official RSC support](https://reactrouter.com/how-to/react-server-components), but this example is kept as an alternative approach.
     It also includes `@cloudflare/vite-plugin` integration.
 - [`./examples/basic`](./examples/basic)
   - This is mainly used for e2e testing and include various advanced RSC usages (e.g. `"use cache"` example).

packages/plugin-rsc/examples/react-router/README.md

@@ -2,7 +2,10 @@
 
 https://vite-rsc-react-router.hiro18181.workers.dev
 
-This example demonstrates how to integrate [React Router RSC](https://reactrouter.com/how-to/react-server-components) with `@vitejs/plugin-rsc`. React Router now provides official React Server Components support, allowing you to build full-stack applications with server-side rendering and client-side routing.
+> [!NOTE]
+> This example demonstrates a custom integration of React Router with RSC using `@vitejs/plugin-rsc`. While React Router now provides [official RSC support](https://reactrouter.com/how-to/react-server-components), this example represents a less official setup that predates the official implementation. It's kept for posterity and as an alternative approach for those who prefer this integration method.
+
+This example demonstrates how to integrate React Router with React Server Components using `@vitejs/plugin-rsc`.
 
 See also: