code: def update_group(self, group, process_id, wit_ref_name, page_id, section_id, group_id):
          
          route_values = {}
          if process_id is not None:
              route_values['processId'] = self._serialize.url('process_id', process_id, 'str')
          if wit_ref_name is not None:
              route_values['witRefName'] = self._serialize.url('wit_ref_name', wit_ref_name, 'str')
          if page_id is not None:
              route_values['pageId'] = self._serialize.url('page_id', page_id, 'str')
          if section_id is not None:
              route_values['sectionId'] = self._serialize.url('section_id', section_id, 'str')
          if group_id is not None:
              route_values['groupId'] = self._serialize.url('group_id', group_id, 'str')
          content = self._serialize.body(group, 'Group')
          response = self._send(http_method='PATCH',
                                location_id='766e44e1-36a8-41d7-9050-c343ff02f7a5',
                                version='5.0-preview.1',
                                route_values=route_values,
                                content=content)
          return self._deserialize('Group', response)
docs: UpdateGroup.
          [Preview API] Updates a group in the work item form.
          :param :class:`<Group> <azure.devops.v5_0.work_item_tracking_process.models.Group>` group: The updated group.
          :param str process_id: The ID of the process.
          :param str wit_ref_name: The reference name of the work item type.
          :param str page_id: The ID of the page the group is in.
          :param str section_id: The ID of the section the group is in.
          :param str group_id: The ID of the group.
          :rtype: :class:`<Group> <azure.devops.v5_0.work_item_tracking_process.models.Group>`