code: def update_member(self, member_id, peer_urls):
          
          member_update_request = etcdrpc.MemberUpdateRequest(ID=member_id,
                                                              peerURLs=peer_urls)
          self.clusterstub.MemberUpdate(
              member_update_request,
              self.timeout,
              credentials=self.call_credentials,
              metadata=self.metadata
          )
docs: Update the configuration of an existing member in the cluster.
  
          :param member_id: ID of the member to update
          :param peer_urls: new list of peer urls the member will use to
                            communicate with the cluster