Update the doc to change a deprecated use case

ChristopheBoucaut · xabbuh · commit ced63f2bd198 · 2016-01-13T17:13:29.000+01:00
diff --git a/components/form/introduction.rst b/components/form/introduction.rst
@@ -457,6 +457,7 @@ builder:
 
     .. code-block:: php-standalone
 
+        use Symfony\Component\Form\Extension\Core\Type\FormType;
         use Symfony\Component\Form\Extension\Core\Type\TextType;
         use Symfony\Component\Form\Extension\Core\Type\DateType;
 
@@ -466,7 +467,7 @@ builder:
             'dueDate' => new \DateTime('tomorrow'),
         );
 
-        $form = $formFactory->createBuilder('form', $defaults)
+        $form = $formFactory->createBuilder(FormType::class, $defaults)
             ->add('task', TextType::class)
             ->add('dueDate', DateType::class)
             ->getForm();
