Removed commenting around "container, application"

Was causing error "Uncaught ReferenceError: application is not defined"

Author: joeczucha

source/understanding-ember/dependency-injection-and-service-lookup.md

@@ -149,7 +149,7 @@ Ember's container should be viewed as an implementation detail, and is not part
 Instead of accessing the container directly, Ember provides an API for registering factories and managing injections on the application instance with an initializer
 
 ```app/initializers/logger.js
-export function initialize(/* container, application */) {
+export function initialize(container, application) {
   var logger = {
     log: function(message) {
       console.log(message);