docs: fix prettier error (#51182)

docs/02-app/01-building-your-application/03-data-fetching/04-server-actions.mdx

@@ -110,16 +110,16 @@ export async function myAction() {
 ```
 
 ```jsx filename="app/client-component.jsx" highlight={1}
-"use client"
+'use client'
 
-import { myAction } from './actions';
+import { myAction } from './actions'
 
 export default function ClientComponent() {
   return (
     <form action={myAction}>
       <button type="submit">Add to Cart</button>
     </form>
-  );
+  )
 }
 ```