title: git FETCH_HEAD short lived reference
body: <ol>
  <li><p>I read <a href="https://stackoverflow.com/a/9237511/2844702">here</a> that git FETCH_HEAD is a short lived reference . What is the life of git FETCH_HEAD reference ?</p></li>
  <li><p>When I do <code>git fetch origin</code> , in such cases many remote tracking branch are updated. Where will FETCH_HEAD point to ?</p></li>
  </ol>