Update code examples to use Smarty\Smarty and autoload instead of require_once calls and new Smarty

docs/programmers/resources/template-resources.md

@@ -26,6 +26,8 @@ on the functions you are supposed to provide.
 
 
     <?php
+    use Smarty\Smarty;
+
 
     /**
      * MySQL Resource
@@ -103,7 +105,7 @@ on the functions you are supposed to provide.
     }
 
 
-    require_once 'libs/Smarty.class.php';
+   
     $smarty = new Smarty();
     $smarty->registerResource('mysql', new My_Resource_Mysql());