Add even more role="button" attributes

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

examples/theme/index.html

@@ -65,7 +65,7 @@
       <div class="jumbotron">
         <h1>Hello, world!</h1>
         <p>This is a template for a simple marketing or informational website. It includes a large callout called the hero unit and three supporting pieces of content. Use it as a starting point to create something more unique.</p>
-        <p><a class="btn btn-primary btn-lg">Learn more &raquo;</a></p>
+        <p><a class="btn btn-primary btn-lg" role="button">Learn more &raquo;</a></p>
       </div>