You can get a simple tooltip over the glyphicon using the title attribute (which is blank in your example).
title="info"
Working code
// add this in your js
// all the glyphicons having the class "my-tooltip" will show a tooltip if "title" attribute is present
$(".my-tooltip").tooltip();
<span class="glyphicon glyphicon-info-sign my-tooltip" title="here goes the tooltip text"></span>