docs: fix @var type to fix PHPStan error

Author: kenjis

system/Router/AutoRouter.php

@@ -13,6 +13,7 @@
 
 use Closure;
 use CodeIgniter\Exceptions\PageNotFoundException;
+use CodeIgniter\HTTP\ResponseInterface;
 
 /**
  * Router for Auto-Routing
@@ -29,7 +30,7 @@ public function __construct(
         /**
          * List of CLI routes that do not contain '*' routes.
          *
-         * @var array<string, Closure|string> [routeKey => handler]
+         * @var array<string, Closure(): (ResponseInterface|string|void)|string> [routeKey => handler]
          */
         private readonly array $cliRoutes,
         /**