Break down code into separate lines

content/docs/hello-world.md

@@ -9,9 +9,8 @@ next: introducing-jsx.html
 The smallest React example looks like this:
 
 ```jsx
-ReactDOM
-  .createRoot(document.getElementById('root'))
-  .render(<h1>Hello, world!</h1>);
+const root = ReactDOM.createRoot(document.getElementById('root'));
+root.render(<h1>Hello, world!</h1>);
 ```
 
 It displays a heading saying "Hello, world!" on the page.