docs: def _set_linters(self):
          """Use user linters or all available when not specified."""
          if 'linters' in self._config:
              self.user_linters = list(self._parse_cfg_linters())
              self.linters = {linter: self._all_linters[linter]
                              for linter in self.user_linters}
          else:
              self.linters = self._all_linters