Improved sample code for PHP file

Author: datamweb

docs/customization/integrating_custom_view_libs.md

@@ -5,6 +5,12 @@ If your application uses a different method to convert view files to HTML than C
 All controllers and actions use the `CodeIgniter\Shield\Traits\Viewable` trait which provides a simple `view()` method that takes the same arguments as the `view()` helper. This allows you to extend the Action or Controller and only change the single method of rendering the view, leaving all of the logic untouched so your app will not need to maintain Shield logic when it doesn't need to change it.
 
 ```php
+<?php
+
+declare(strict_types=1);
+
+namespace App\Controllers;
+
 use Acme\Themes\Traits\Themeable;
 use CodeIgniter\Shield\Controllers\LoginController;