nextcloud/settings/templates/help.php

<div id="controls">
        <?php if($_['admin']) { ?><a class="button newquestion <?php echo($_['style1']); ?>" href="<?php echo($_['url1']); ?>"><?php echo $l->t( 'User Documentation' ); ?></a><?php } ?>
        <?php if($_['admin']) { ?><a class="button newquestion <?php echo($_['style2']); ?>" href="<?php echo($_['url2']); ?>"><?php echo $l->t( 'Administrator Documentation' ); ?></a><?php } ?>
        <a class="button newquestion" href="http://owncloud.org/support" target="_blank"><?php echo $l->t( 'Online Documentation' ); ?></a>
        <a class="button newquestion" href="http://forum.owncloud.org" target="_blank"><?php echo $l->t( 'Forum' ); ?></a>
        <?php if($_['admin']) { ?><a class="button newquestion" href="https://github.com/owncloud/core/issues" target="_blank"><?php echo $l->t( 'Bugtracker' ); ?></a><?php } ?>
        <a class="button newquestion" href="http://owncloud.com" target="_blank"><?php echo $l->t( 'Commercial Support' ); ?></a>
</div>
<br /><br />
<iframe src="<?php echo($_['url']); ?>" width="100%" id="ifm" ></iframe>


<script language="JavaScript">
<!--

function pageY(elem) {
    return elem.offsetParent ? (elem.offsetTop + pageY(elem.offsetParent)) : elem.offsetTop;
}
var buffer = 5; //scroll bar buffer
function resizeIframe() {
    var height = document.documentElement.clientHeight;
    height -= pageY(document.getElementById('ifm'))+ buffer ;
    height = (height < 0) ? 0 : height;
    document.getElementById('ifm').style.height = height + 'px';
}

document.getElementById('ifm').onload=resizeIframe;
window.onresize = resizeIframe;

//-->
</script>