docs: def Modify(self, user_type=None, password=None):
      """Modifies user's type and/or password."""
  
      args = user_management_pb2.ApiModifyGrrUserArgs(
          username=self.username, user_type=user_type)
  
      if user_type is not None:
        args.user_type = user_type
  
      if password is not None:
        args.password = password
  
      data = self._context.SendRequest("ModifyGrrUser", args)
      return GrrUser(data=data, context=self._context)