title: Twig tag include vs function include
body: <p>Twig's documentation for <a href="http://twig.symfony.com/doc/tags/include.html" rel="nofollow noreferrer">tag include</a> looks very similar to that of <a href="http://twig.symfony.com/doc/functions/include.html" rel="nofollow noreferrer">function include</a>.</p>
  <p>Tag include:</p>
  <pre><code>{% include 'header.html' %}
  </code></pre>
  <p>Function include:</p>
  <pre><code>{{ include('template.html') }}
  </code></pre>
  <p>Can somebody point out in what circumstances, one is preferred over the other? Thanks!</p>