Remove extraneous comment

This little guy should have been removed in 6bd6ef2

src/addons/transitions/ReactCSSTransitionGroupChild.js

@@ -19,10 +19,6 @@ var ReactTransitionEvents = require('ReactTransitionEvents');
 
 var onlyChild = require('onlyChild');
 
-// We don't remove the element from the DOM until we receive an animationend or
-// transitionend event. If the user screws up and forgets to add an animation
-// their node will be stuck in the DOM forever, so we detect if an animation
-// does not start and if it doesn't, we just call the end listener immediately.
 var TICK = 17;
 
 var ReactCSSTransitionGroupChild = React.createClass({