docs: update comments in Config/Autoload.php

Author: kenjis

app/Config/Autoload.php

@@ -30,22 +30,18 @@ class Autoload extends AutoloadConfig
      * their location on the file system. These are used by the autoloader
      * to locate files the first time they have been instantiated.
      *
-     * The '/app' and '/system' directories are already mapped for you.
-     * you may change the name of the 'App' namespace if you wish,
+     * The 'Config' (APPPATH . 'Config') and 'CodeIgniter' (SYSTEMPATH) are
+     * already mapped for you.
+     *
+     * You may change the name of the 'App' namespace if you wish,
      * but this should be done prior to creating any namespaced classes,
      * else you will need to modify all of those classes for this to work.
      *
-     * Prototype:
-     *   $psr4 = [
-     *       'CodeIgniter' => SYSTEMPATH,
-     *       'App'         => APPPATH
-     *   ];
-     *
      * @var array<string, array<int, string>|string>
      * @phpstan-var array<string, string|list<string>>
      */
     public $psr4 = [
-        APP_NAMESPACE => APPPATH, // For custom app namespace
+        APP_NAMESPACE => APPPATH,
     ];
 
     /**