Fixed warning

Addressed warnings / errors highlighted by phpcs

src/Form/ProtectedPagePasswordForm.php

@@ -57,8 +57,8 @@ class ProtectedPagePasswordForm extends FormBase {
    *   An associative array containing the structure of the form.
    * @param \Drupal\Core\Form\FormStateInterface $form_state
    *   The current state of the form.
-   * @param string|null $protected_page
-   *   The path of the protected page.
+   * @param \Symfony\Component\HttpFoundation\Request|null $request
+   *   (optional) The Symfony HTTP request object. Defaults to NULL.
    *
    * @return array
    *   The form structure.