code: def update_letter_comment(self, letter_comment_id, letter_comment_dict):
          
          return self._create_put_request(
              resource=LETTER_COMMENTS,
              billomat_id=letter_comment_id,
              send_data=letter_comment_dict
          )
docs: Updates a letter comment
  
          :param letter_comment_id: the letter command id
          :param letter_comment_dict: dict
          :return: dict