Tweak event delegation notes

Author: gaearon

content/docs/testing-recipes.md

@@ -377,7 +377,6 @@ let container = null;
 beforeEach(() => {
   // setup a DOM element as a render target
   container = document.createElement("div");
-  // container *must* be attached to document so events work correctly.
   document.body.appendChild(container);
 });
 
@@ -416,7 +415,7 @@ it("changes value when clicked", () => {
 });
 ```
 
-Different DOM events and their properties are described in [MDN](https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent). Note that you need to pass `{ bubbles: true }` in each event you create for it to reach the React listener because React automatically delegates events to the document.
+Different DOM events and their properties are described in [MDN](https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent). Note that you need to pass `{ bubbles: true }` in each event you create for it to reach the React listener because React automatically delegates events to the root.
 
 > Note:
 >