fix: remove anchor tag with empty href (#3630)

ietf/templates/release/about.html

@@ -56,7 +56,7 @@ <h2>Version 6.0.0: Facelift using Bootstrap 3</h2>
      The work relies heavily on the capabilities of <a href="http://getbootstrap.com">
      Bootstrap</a>, and continues to use the <a href="https://www.djangoproject.org/">Django</a>
      framework which the datatracker has been build on since <a href="/release/2.00/">version
-     2.00</a>.  It also uses icons from <a href="">FontAwesome</a>, and functions from
+     2.00</a>.  It also uses icons from FontAwesome, and functions from
      <a href="https://django-bootstrap3.readthedocs.org/">django-bootstrap3</a>.
 
   </p>