Small typo in architecture example for backbone, closes #91

Signed-off-by: drublic <hans@sa-designz.de>

architecture-examples/backbone/js/todos.js

 // An example Backbone application contributed by
 // [Jérôme Gravel-Niquet](http://jgn.me/). This demo uses a simple
-// [LocalStorage adapter](backbone-localstorage.html)
+// [LocalStorage adapter](backbone-localstorage.js)
 // to persist Backbone models within your browser.
 
 // Load the application once the DOM is ready, using `jQuery.ready`: