docs: def run(self):
          """Fetch remote code."""
          link = self.content[0]
          try:
              r = requests.get(link)
              r.raise_for_status()
              self.content = [r.text]
              return super(RemoteCodeBlock, self).run()
          except Exception:
              document = self.state.document
              err = 'Unable to resolve ' + link
              return [document.reporter.warning(str(err), line=self.lineno)]