diff -u b/core/modules/views/lib/Drupal/views/Ajax/SetFormCommand.php b/core/modules/views/lib/Drupal/views/Ajax/SetFormCommand.php
--- b/core/modules/views/lib/Drupal/views/Ajax/SetFormCommand.php
+++ b/core/modules/views/lib/Drupal/views/Ajax/SetFormCommand.php
@@ -45,7 +45,7 @@
    * @param string $title
    *   The title of the form.
    * @param string $url
-   *   An optional URL of the form..
+   *   (optional) An optional URL of the form.
    */
   public function __construct($output, $title, $url = NULL) {
     $this->output = $output;
diff -u b/core/modules/views/views.api.php b/core/modules/views/views.api.php
--- b/core/modules/views/views.api.php
+++ b/core/modules/views/views.api.php
@@ -603,12 +603,12 @@
  *
  * @param array $commands
  *   An array of ajax commands.
- * @param \Drupal\views\ViewExecutable|\ViewExecutable $view
+ * @param \Drupal\views\ViewExecutable $view
  *   The view which is requested.
  *
  * @see views_ajax()
  */
-function hook_views_ajax_data_alter(array &$commands, ViewExecutable $view) {
+function hook_views_ajax_data_alter(array &$commands, \Drupal\views\ViewExecutable $view) {
   // Replace Views' method for scrolling to the top of the element with your
   // custom scrolling method.
   foreach ($commands as &$command) {