fixed html syntax in admin_activity & syntax in who's online

<a href='#crh-start'></a><a href='#crh-data-%7B%7D'></a>
<a href='https://www.codereviewhub.com/'><img src='http://www.codereviewhub.com/site/github-bar.png' height=40></a>
<a href='https://www.codereviewhub.com/zencart/zc-v1-series/pull/136?approve=1'><img src='http://www.codereviewhub.com/site/github-approve.png' height=26></a>&nbsp;<a href='https://github.com/zencart/zc-v1-series/pull/136'><img src='http://www.codereviewhub.com/site/github-refresh.png' height=26></a>
<a href='#crh-end'></a>
Apart from hyphenating this line (and I'd argue that it should be /* commented */ instead), and changing the line-ending character on every line in this file, I don't see what other reason you've touched this file at all.