docs: fix doc comments

I think there is no way to set 404 closure in the constructor.

Author: kenjis

app/Config/Routing.php

@@ -63,13 +63,12 @@ class Routing extends BaseRouting
 
     /**
      * Sets the class/method that should be called if routing doesn't
-     * find a match. It can be either a closure or the controller/method
-     * name exactly like a route is defined: Users::index
+     * find a match. It can be the controller/method name like: Users::index
      *
      * This setting is passed to the Router class and handled there.
      *
      * If you want to use a closure, you will have to set it in the
-     * class constructor or the routes file by calling:
+     * routes file by calling:
      *
      * $routes->set404Override(function() {
      *    // Do something here

system/Config/Routing.php

@@ -61,13 +61,12 @@ class Routing extends BaseConfig
 
     /**
      * Sets the class/method that should be called if routing doesn't
-     * find a match. It can be either a closure or the controller/method
-     * name exactly like a route is defined: Users::index
+     * find a match. It can be the controller/method name like: Users::index
      *
      * This setting is passed to the Router class and handled there.
      *
      * If you want to use a closure, you will have to set it in the
-     * class constructor or the routes file by calling:
+     * routes file by calling:
      *
      * $routes->set404Override(function() {
      *    // Do something here