Surface.js - fixed typo in comment

Author: stevenw

lib/Surface.js

@@ -12,7 +12,7 @@ var layoutNode = require('./layoutNode');
 
 /**
  * Surface is a standard React component and acts as the main drawing canvas.
- * ReactCanvas comopnents cannot be rendered outside a Surface.
+ * ReactCanvas components cannot be rendered outside a Surface.
  */
 
 var Surface = React.createClass({
@@ -216,4 +216,4 @@ var Surface = React.createClass({
 
 });
 
-module.exports = Surface;
+module.exports = Surface;