Example is JSX not JS.

docs/02-displaying-data.md

@@ -32,7 +32,7 @@ Let's look at a really simple example. Create a `hello-react.html` file with the
 </html>
 ```
 
-For the rest of the documentation, we'll just focus on the JavaScript code and assume it's inserted into a template like the one above. Replace the placeholder comment above with the following JS:
+For the rest of the documentation, we'll just focus on the JavaScript code and assume it's inserted into a template like the one above. Replace the placeholder comment above with the following JSX:
 
 ```javascript
 var HelloWorld = React.createClass({