remove comments about chainable methods (fluent interface was removed)

src/Silex/Application.php

@@ -177,8 +177,6 @@ class Application extends \Pimple implements HttpKernelInterface, EventSubscribe
      *
      * Before filters are run before any route has been matched.
      *
-     * This method is chainable.
-     *
      * @param mixed $callback Before filter callback
      */
     public function before($callback)
@@ -191,8 +189,6 @@ class Application extends \Pimple implements HttpKernelInterface, EventSubscribe
      *
      * After filters are run after the controller has been executed.
      *
-     * This method is chainable.
-     *
      * @param mixed $callback After filter callback
      */
     public function after($callback)
@@ -213,8 +209,6 @@ class Application extends \Pimple implements HttpKernelInterface, EventSubscribe
      *
      * For this reason you should add logging handlers before output handlers.
      *
-     * This method is chainable.
-     *
      * @param mixed $callback Error handler callback, takes an Exception argument
      */
     public function error($callback)