title: Include Hyperlink (with _blank target) property inside NgbTooltip content
body: <p>I have a requirement with the NgbTooltip, </p>
  
  <ul>
  <li>the tooltip should allow to include a hyperlink with "_blank" target. ex: Learn more</li>
  <li>the tooltip should hide when clicked on the document body.</li>
  </ul>
  
  <p>Below is my approach, and doesn't work as expected. </p>
  
  <pre><code>&lt;a [ngbTooltip]="hintTooltip" tabindex="0"  triggers="click:blur"&gt;hint&lt;/a&gt;
  &lt;ng-template #hintTooltip&gt;
    Sample hint description
    &lt;a href="www.abc.com" target="_blank"&gt;Learn more&lt;/a&gt;
  &lt;/ng-template&gt;
  </code></pre>
  
  <p>the above code opens the tooltip by showing the hyperlink. but when I click the hyperlink, instead of opening a new window, it hides the tooltip.</p>
  
  <p>stackblitz: <a href="https://stackblitz.com/edit/angular-viipeo-dqjmfh?file=app/tooltip-triggers.html" rel="nofollow noreferrer">https://stackblitz.com/edit/angular-viipeo-dqjmfh?file=app/tooltip-triggers.html</a></p>
  
  <p>Appreciate if anyone can help</p>