Fix readme and release notes.

README.md

@@ -118,13 +118,8 @@ implement it for our Server struct.
 struct HelloServer;
 
 impl World for HelloServer {
-    // Each defined rpc generates two items in the trait, a fn that serves the RPC, and
-    // an associated type representing the future output by the fn.
-
-    type HelloFut = Ready<String>;
-
-    fn hello(self, _: context::Context, name: String) -> Self::HelloFut {
-        future::ready(format!("Hello, {name}!"))
+    async fn hello(self, _: context::Context, name: String) -> String {
+        format!("Hello, {name}!")
     }
 }
 ```

RELEASES.md

@@ -14,7 +14,7 @@
 ### New Features
 
 - Request hooks are added to the serve trait, so that it's easy to hook in cross-cutting
-  functionality look throttling, authorization, etc.
+  functionality like throttling, authorization, etc.
 - The Client trait is back! This makes it possible to hook in generic client functionality like load
   balancing, retries, etc.