Add link to RFC #213

Author: rickhanlonii

text/0000-react-18.md

@@ -63,7 +63,7 @@ Transitions will opt in to concurrent rendering, which allows the update to be i
 
 ### New Suspense features
 
-These features are outlined in a separate RFC.
+[These features are outlined in a separate RFC](https://github.com/reactjs/rfcs/pull/213).
 
 ### New client and server rendering APIs