docs: def delete_label_by_id(self, content_id, label_name, callback=None):
          """
          Deletes a labels to the specified content.
  
          There is an alternative form of this delete method that is not implemented. A DELETE request to
          /rest/api/content/{id}/label/{label} will also delete a label, but is more limited in the label name
          that can be accepted (and has no real apparent upside).
  
          :param content_id (string): A string containing the id of the labels content container.
          :param label_name (string): OPTIONAL: The name of the label to be removed from the content.
                                      Default: Empty (probably deletes all labels).
          :param callback: OPTIONAL: The callback to execute on the resulting data, before the method returns.
                           Default: None (no callback, raw data returned).
          :return: Empty if successful, or the results of the callback.
                   Will raise requests.HTTPError on bad input, potentially.
          """
          params = {"name": label_name}
          return self._service_delete_request("rest/api/content/{id}/label".format(id=content_id),
                                              params=params, callback=callback)