Add missing verb

This adds a missing verb in JSX-in-depth doc.

docs/02.1-jsx-in-depth.md

@@ -29,7 +29,7 @@ var myDivElement = <div className="foo" />;
 React.render(myDivElement, document.body);
 ```
 
-To render a React Component, just a local variable that starts with an upper-case letter:
+To render a React Component, just create a local variable that starts with an upper-case letter:
 
 ```javascript
 var MyComponent = React.createClass({/*...*/});