docs: def edit(self, entity, id, payload, sync=True):
          """ Edit a document. """
          url = urljoin(self.host, entity.value + '/')
          url = urljoin(url, id + '/')
          params = {'sync': str(sync).lower()}
          url = Utils.add_url_parameters(url, params)
          r = requests.put(url, auth=self.auth, data=json.dumps(payload),
                           headers=self.headers)
          if r.status_code == 500:
              error_message = r.json()['error_message']
              raise CoredataError('Error! {error}'.format(error=error_message))