docs(js): Update stale reference (#12964)

Author: chargome

docs/platforms/javascript/guides/react/features/react-router/v7.mdx

@@ -6,7 +6,7 @@ sidebar_order: 10
 
 
 <Alert level="warning" title="Looking for framework mode?">
-  - React Router v7 (framework mode) is not yet supported, but we do provide a guide on how to set it up using existing SDKs [here](/platforms/javascript/guides/react-router/).
+  - React Router v7 (framework mode) is currently in experimental Alpha, check out the docs [here](/platforms/javascript/guides/react-router/).
 </Alert>
 
 <Alert level="info">