Fix async-await syntax (#6554)

Author: jamiebuilds

src/content/reference/react/use.md

@@ -337,7 +337,7 @@ When passing a Promise from a Server Component to a Client Component, its resolv
 A Promise can be passed from a Server Component to a Client Component and resolved in the Client Component with the `use` Hook. You can also resolve the Promise in a Server Component with `await` and pass the required data to the Client Component as a prop.
 
 ```js
-export default function App() {
+export default async function App() {
   const messageContent = await fetchMessage();
   return <Message messageContent={messageContent} />
 }