docs: def do_preferrep(self, line):
          """preferrep <member node> [member node ...] Add one or more preferred Member
          Nodes to replication policy."""
          mns = self._split_args(line, 1, -1)
          self._command_processor.get_session().get_replication_policy().add_preferred(
              mns
          )
          self._print_info_if_verbose(
              "Set {} as preferred replication target(s)".format(", ".join(mns))
          )