Give a hint about old multi-language error documents

      that the size overhead added by the compression is larger than the data

      to be compressed.

      </li>

      <li>Multi-language error documents from 2.2.x may not work unless

      they are adjusted to the new syntax of <module>mod_include</module>'s

      <code>#if expr=</code> element or the directive

      <directive module="mod_include">SSILegacyExprParser</directive> is

      enabled for the directory containing the error documents.

      </li>

    </ul>

  </section>