code: def remove_page(self, process_id, wit_ref_name, page_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')
          self._send(http_method='DELETE',
                     location_id='1cc7b29f-6697-4d9d-b0a1-2650d3e1d584',
                     version='5.0-preview.1',
                     route_values=route_values)
docs: RemovePage.
          [Preview API] Removes a page from the work item form
          :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