Merge pull request #42 from reactjs/sync-cb5a61cd

Sync with reactjs.org @ cb5a61c

Author: ltmylinh

content/docs/hooks-faq.md

@@ -610,14 +610,16 @@ function ProductPage({ productId }) {
 
 This also allows you to handle out-of-order responses with a local variable inside the effect:
 
-```js{2,6,8}
+```js{2,6,10}
   useEffect(() => {
     let ignore = false;
     async function fetchProduct() {
       const response = await fetch('http://myapi/product/' + productId);
       const json = await response.json();
       if (!ignore) setProduct(json);
     }
+    
+    fetchProduct();
     return () => { ignore = true };
   }, [productId]);
 ```