code: def update_comment(self, comment_id, body):
          
          path = '/msg/update_comment'
          req = ET.Element('request')
          ET.SubElement(req, 'comment_id').text = str(int(comment_id))
          comment = ET.SubElement(req, 'comment')
          ET.SubElement(comment, 'body').text = str(body)
          return self._request(path, req)
docs: Update a specific comment. This can be used to edit the content of an
          existing comment.