Update Simulate docs to reflect reality

cf. #1532, #1445.

docs/09.4-test-utils.md

@@ -12,17 +12,18 @@ next: clone-with-props.html
 ### Simulate
 
 ```javascript
-Simulate.{eventName}({ReactComponent|DOMElement} element, object eventData)
+Simulate.{eventName}(DOMElement element, object eventData)
 ```
 
-Simulate an event dispatch on a React component instance or browser DOM node with optional `eventData` event data. **This is possibly the single most useful utility in `ReactTestUtils`.**
+Simulate an event dispatch on a DOM node with optional `eventData` event data. **This is possibly the single most useful utility in `ReactTestUtils`.**
 
 Example usage:
 
 ```javascript
-React.addons.TestUtils.Simulate.click(myComponent);
-React.addons.TestUtils.Simulate.change(myComponent);
-React.addons.TestUtils.Simulate.keyDown(myComponent, {key: "Enter"});
+var node = this.refs.input.getDOMNode();
+React.addons.TestUtils.Simulate.click(node);
+React.addons.TestUtils.Simulate.change(node);
+React.addons.TestUtils.Simulate.keyDown(node, {key: "Enter"});
 ```
 
 `Simulate` has a method for every event that React understands.