code: def description(self, request, id, description):
          
          request.data = json.dumps({
              "description": description
          })
          return self.send(request, id).json()['html_url']
docs: Updates the description of a gist
  
          Arguments:
              request:     an initial request object
              id:          the id of the gist we want to edit the description for
              description: the new description