docs: def _update_listing_client_kwargs(client_kwargs, max_request_entries):
          """
          Updates client kwargs for listing functions.
  
          Args:
              client_kwargs (dict): Client arguments.
              max_request_entries (int): If specified, maximum entries returned
                  by request.
  
          Returns:
              dict: Updated client_kwargs
          """
          client_kwargs = client_kwargs.copy()
          if max_request_entries:
              client_kwargs['num_results'] = max_request_entries
          return client_kwargs