Merge pull request #10210 from acmetech/master

Update the example for components/#btn-groups-justified to match the "Element-specific usage" callout

components.html

@@ -558,9 +558,9 @@ base_url: "../"
 
     <div class="bs-example">
       <div class="btn-group btn-group-justified">
-        <button type="button" class="btn btn-default">Left</button>
-        <button type="button" class="btn btn-default">Middle</button>
-        <button type="button" class="btn btn-default">Right</button>
+        <a class="btn btn-default" role="button">Left</a>
+        <a class="btn btn-default" role="button">Middle</a>
+        <a class="btn btn-default" role="button">Right</a>
       </div>
     </div>
 {% highlight html %}