Admin/website/include/mirrorlist.major.include.html

some minor improvements

<?xml version='1.0' encoding='iso-8859-1' ?>
<!DOCTYPE div PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<!-- $Id$ -->
<div class="mirrorlist">
    <p>Switch mirror:</p>
    <ul>
        <li><?mirror prefix="http://www.cl.cam.ac.uk/Research/HVG/Isabelle/" title="Cambridge" ?></li>
        <li><?mirror prefix="http://isabelle.in.tum.de/"                         title="Munich"    ?></li>
    </ul>
</div>