docs: def is_valid_pid_to_be_updated(did):
      """Assert that ``did`` is the PID of an object that can be updated (obsoleted) with
      MNStorage.update()"""
      if not d1_gmn.app.did.is_valid_pid_to_be_updated(did):
          raise d1_common.types.exceptions.InvalidRequest(
              0,
              'Object cannot be updated because the identifier for the object to be '
              'updated is {}. did="{}"'.format(
                  d1_gmn.app.did.classify_identifier(did), did
              ),
              identifier=did,
          )