Issue #3075404 by eiriksm: Wrong return type in several access_check service docblocks

core/modules/node/src/Access/NodeAddAccessCheck.php

@@ -48,8 +48,8 @@ public function __construct(EntityTypeManagerInterface $entity_type_manager) {
    *   (optional) The node type. If not specified, access is allowed if there
    *   exists at least one node type for which the user may create a node.
    *
-   * @return string
-   *   A \Drupal\Core\Access\AccessInterface constant value.
+   * @return \Drupal\Core\Access\AccessResultInterface
+   *   The access result.
    */
   public function access(AccountInterface $account, NodeTypeInterface $node_type = NULL) {
     $access_control_handler = $this->entityTypeManager->getAccessControlHandler('node');

core/modules/node/src/Access/NodePreviewAccessCheck.php

@@ -46,8 +46,8 @@ public function __construct(EntityTypeManagerInterface $entity_type_manager) {
    * @param \Drupal\node\NodeInterface $node_preview
    *   The node that is being previewed.
    *
-   * @return string
-   *   A \Drupal\Core\Access\AccessInterface constant value.
+   * @return \Drupal\Core\Access\AccessResultInterface
+   *   The access result.
    */
   public function access(AccountInterface $account, NodeInterface $node_preview) {
     if ($node_preview->isNew()) {

core/modules/system/src/Access/DbUpdateAccessCheck.php

@@ -18,8 +18,8 @@ class DbUpdateAccessCheck implements AccessInterface {
    * @param \Drupal\Core\Session\AccountInterface $account
    *   The currently logged in account.
    *
-   * @return string
-   *   A \Drupal\Core\Access\AccessInterface constant value.
+   * @return \Drupal\Core\Access\AccessResultInterface
+   *   The access result.
    */
   public function access(AccountInterface $account) {
     // Allow the global variable in settings.php to override the access check.

core/modules/system/tests/modules/router_test_directory/src/Access/TestAccessCheck.php

@@ -13,8 +13,8 @@ class TestAccessCheck implements AccessInterface {
   /**
    * Checks access.
    *
-   * @return string
-   *   A \Drupal\Core\Access\AccessInterface constant value.
+   * @return \Drupal\Core\Access\AccessResultInterface
+   *   The access result.
    */
   public function access() {
     // No opinion, so other access checks should decide if access should be