Merge pull request #2649 from cookfront/master

In `Transferring Props` guide, `Manual Transfer` section will lead an er...

docs/docs/06-transferring-props.md

@@ -38,7 +38,7 @@ var FancyCheckbox = React.createClass({
   }
 });
 React.render(
-  <FancyCheckbox checked={true} onClick={console.log}>
+  <FancyCheckbox checked={true} onClick={console.log.bind(console)}>
     Hello world!
   </FancyCheckbox>,
   document.body