[docs] Clear up “confusing arrows” example.

ljharb · ljharb · commit 28a04a3a45d1 · 2016-06-21T22:41:03.000-07:00
Closes airbnb#856.
diff --git a/README.md b/README.md
@@ -912,7 +912,13 @@ Other Style Guides
     const itemHeight = (item) => item.height > 256 ? item.largeSize : item.smallSize;
 
     // good
-    const itemHeight = (item) => { return item.height > 256 ? item.largeSize : item.smallSize; };
+    const itemHeight = item => (item.height > 256 ? item.largeSize : item.smallSize);
+
+    // good
+    const itemHeight = (item) => {
+      const { height, largeSize, smallSize } = item;
+      return height > 256 ? largeSize : smallSize;
+    };
     ```
 
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