Add even more role="button" attributes

Missed the <a class="btw" in my regex search

examples/navbar-fixed-top/index.html

@@ -70,7 +70,7 @@
         <p>This example is a quick exercise to illustrate how the default, static and fixed to top navbar work. It includes the responsive CSS and HTML, so it also adapts to your viewport and device.</p>
         <p>To see the difference between static and fixed top navbars, just scroll.</p>
         <p>
-          <a class="btn btn-lg btn-primary" href="../../components/#navbar">View navbar docs &raquo;</a>
+          <a class="btn btn-lg btn-primary" href="../../components/#navbar" role="button">View navbar docs &raquo;</a>
         </p>
       </div>