Add missing comma (,) between propTypes and render

Add missing comma (,) between `propTypes` and `render`

docs/10.6-create-fragment.md

@@ -18,7 +18,7 @@ var Swapper = React.createClass({
     rightChildren: React.PropTypes.node,
 
     swapped: React.PropTypes.bool
-  }
+  },
   render: function() {
     var children;
     if (this.props.swapped) {