fix docs

Author: petehunt

docs/docs/09.4-test-utils.md

@@ -7,11 +7,11 @@ prev: class-name-manipulation.html
 next: examples.html
 ---
 
-`React.addons.TestUtils` makes it easy to test React components in the testing framework of your choice (we use [Jasmine](http://pivotal.github.io/jasmine/)). All functions except for `renderIntoDocument()` work without a browser DOM.
+`React.addons.TestUtils` makes it easy to test React components in the testing framework of your choice (we use [Jasmine](http://pivotal.github.io/jasmine/) with [jsdom](https://github.com/tmpvar/jsdom)).
 
 #### ReactComponent renderIntoDocument(ReactComponent instance)
 
-Render a component into a detached DOM node in the document. **This is the only function that requires a DOM.**
+Render a component into a detached DOM node in the document. **This function requires a DOM.**
 
 #### boolean isComponentOfType(ReactComponent instance, function componentClass)
 
@@ -67,9 +67,11 @@ Pass a mocked component module to this method to augment it with useful methods
 
 #### Simulate.{eventName}({ReactComponent|DOMElement} element, object nativeEventData)
 
-Simulate an event dispatch on a React component instance or browser DOM node with optional `nativeEventData` event data. This uses React's event system so it works outside of the browser. **This is possibly the single most useful utility in `ReactTestUtils`.**
+Simulate an event dispatch on a React component instance or browser DOM node with optional `nativeEventData` event data. **This is possibly the single most useful utility in `ReactTestUtils`.**
 
-**NOTE:** this helper is used to simulate browser events, so synthetic React events like `change` are not available. If you want to test `change`, simulate the underlying `input` browser event.
+> Note:
+>
+> This helper is used to simulate browser events, so synthetic React events like `change` are not available. If you want to test `change`, simulate the underlying `input` browser event.
 
 Example usage: `React.addons.TestUtils.Simulate.click(myComponent)`