Issue #2865295 by JayKandari: $menuLinkManager property on MenuLinkTree is undocumented

core/lib/Drupal/Core/Menu/MenuLinkTree.php

@@ -21,6 +21,13 @@ class MenuLinkTree implements MenuLinkTreeInterface {
    */
   protected $treeStorage;
 
+  /**
+   * The menu link plugin manager.
+   *
+   * @var \Drupal\Core\Menu\MenuLinkManagerInterface
+   */
+  protected $menuLinkManager;
+
   /**
    * The route provider to load routes by name.
    *