Documentation: Syntax error at "Glyphicons" section

Created by: dirkeinecke

http://getbootstrap.com/components/#glyphicons-examples

Wrong:

<button type="button" class="btn btn-default btn-lg">
  <span class="glyphicon glyphicon-star"></span> Star
</a>

Right:

<button type="button" class="btn btn-default btn-lg">
  <span class="glyphicon glyphicon-star"></span> Star
</button>