Issue #3247205 by beatrizrodrigues, quietone, joachim:...

Issue #3247205 by beatrizrodrigues, quietone, joachim: MigrateDestinationInterface::rollback() should document that its $destination_identifier parameter is an associative array

core/modules/migrate/src/Plugin/MigrateDestinationInterface.php

@@ -122,7 +122,10 @@ public function import(Row $row, array $old_destination_id_values = []);
    * Delete the specified destination object from the target Drupal.
    *
    * @param array $destination_identifier
-   *   The ID of the destination object to delete.
+   *   An associative array of destination IDs for the object to delete. The
+   *   array keys are defined by the
+   *   \Drupal\migrate\Plugin\MigrateDestinationInterface::getIds() method used
+   *   by the destination object.
    */
   public function rollback(array $destination_identifier);