Issue #2469799 by Adita, Xano, Girish-jerk: improve documentation and type hinting of FormValidatorInterface and FormValidator

core/lib/Drupal/Core/Form/FormBuilder.php

@@ -84,11 +84,15 @@ class FormBuilder implements FormBuilderInterface, FormValidatorInterface, FormS
   protected $themeManager;
 
   /**
+   * The form validator.
+   *
    * @var \Drupal\Core\Form\FormValidatorInterface
    */
   protected $formValidator;
 
   /**
+   * The form submitter.
+   *
    * @var \Drupal\Core\Form\FormSubmitterInterface
    */
   protected $formSubmitter;