Remove inappropriate role="button" from download links

docs/_includes/getting-started/download.html

@@ -8,21 +8,21 @@
       <h3 id="download-bootstrap">Bootstrap</h3>
       <p>Compiled and minified CSS, JavaScript, and fonts. No docs or original source files are included.</p>
       <p>
-        <a href="{{ site.download.dist }}" class="btn btn-lg btn-outline" role="button" onclick="ga('send', 'event', 'Getting started', 'Download', 'Download compiled');">Download Bootstrap</a>
+        <a href="{{ site.download.dist }}" class="btn btn-lg btn-outline" onclick="ga('send', 'event', 'Getting started', 'Download', 'Download compiled');">Download Bootstrap</a>
       </p>
     </div>
     <div class="col-sm-4">
       <h3 id="download-source">Source code</h3>
       <p>Source Less, JavaScript, and font files, along with our docs. <strong>Requires a Less compiler and <a href="#grunt">some setup.</a></strong></p>
       <p>
-        <a href="{{ site.download.source }}" class="btn btn-lg btn-outline" role="button" onclick="ga('send', 'event', 'Getting started', 'Download', 'Download source');">Download source</a>
+        <a href="{{ site.download.source }}" class="btn btn-lg btn-outline" onclick="ga('send', 'event', 'Getting started', 'Download', 'Download source');">Download source</a>
       </p>
     </div>
     <div class="col-sm-4">
       <h3 id="download-sass">Sass</h3>
       <p><a href="{{ site.sass_repo }}">Bootstrap ported from Less to Sass</a> for easy inclusion in Rails, Compass, or Sass-only projects.</p>
       <p>
-        <a href="{{ site.download.sass }}" class="btn btn-lg btn-outline" role="button" onclick="ga('send', 'event', 'Getting started', 'Download', 'Download Sass');">Download Sass</a>
+        <a href="{{ site.download.sass }}" class="btn btn-lg btn-outline" onclick="ga('send', 'event', 'Getting started', 'Download', 'Download Sass');">Download Sass</a>
       </p>
     </div>
   </div>