implement feedback

doc/usage.rst

@@ -171,7 +171,7 @@ Now, you can create another controller for viewing individual blog posts::
 This route definition has a variable ``{id}`` part which is passed to the
 closure.
 
-The current ``application`` is automatically injected by Silex to the Closure
+The current ``Application`` is automatically injected by Silex to the Closure
 thanks to the type hinting.
 
 When the post does not exist, we are using ``abort()`` to stop the request