bootstrap/docs/_includes/nav-getting-started.html

<li>
  <a href="#download">Download Bootstrap</a>
  <ul class="nav">
    <li><a href="#download-options">Download options</a></li>
    <li><a href="#download-cdn">Bootstrap CDN</a></li>
  </ul>
</li>
<li>
  <a href="#whats-included">What's included</a>
</li>
<li>
  <a href="#examples">Templates and examples</a>
  <ul class="nav">
    <li><a href="#examples-template">HTML template</a></li>
    <li><a href="#examples-list">List of examples</a></li>
  </ul>
</li>
<li>
  <a href="#customizing">Customizing Bootstrap</a>
</li>