chore: correct stale role_hierarchy comments

src/Controller/Admin/AccommodationBooking/EditController.php

@@ -71,7 +71,8 @@ class EditController extends AbstractController
             ));
         }
 
-        // ROLE_ADMIN inherits ROLE_GROUPS_ADMIN, so this single check covers both.
+        // ROLE_GROUPS_ADMIN is granted explicitly since 6c1073e4 removed it from ROLE_ADMIN's
+        // role_hierarchy — an administrator who needs this has to hold it in their own right.
         $assignableManagers = [];
         if ($this->isGranted('ROLE_GROUPS_ADMIN')) {
             $assignableManagers = $this->userRepo->findGroupsStaff();