You’ll need to pass html option with value true while initializing popover like following.
Demo
JS:
$("[data-toggle=popover]")
.popover({html:true})
HTML:
<a href="#" role="button" class="btn popovers" data-toggle="popover" title="" data-content="test content <a href="" title="test add link">link on content</a>" data-original-title="test title" target="_blank">test link</a>