add .btn-xs to .btn-group example

components.html

@@ -408,6 +408,18 @@ base_url: "../"
             <li><a href="#">Separated link</a></li>
           </ul>
         </div><!-- /btn-group -->
+        <div class="btn-group">
+          <button class="btn btn-default btn-xs dropdown-toggle" type="button" data-toggle="dropdown">
+            Extra small button <span class="caret"></span>
+          </button>
+          <ul class="dropdown-menu">
+            <li><a href="#">Action</a></li>
+            <li><a href="#">Another action</a></li>
+            <li><a href="#">Something else here</a></li>
+            <li class="divider"></li>
+            <li><a href="#">Separated link</a></li>
+          </ul>
+        </div><!-- /btn-group -->
       </div><!-- /btn-toolbar -->
     </div><!-- /example -->
 {% highlight html %}
@@ -430,6 +442,15 @@ base_url: "../"
     ...
   </ul>
 </div>
+
+<!-- Extra small button group -->
+<div class="btn-group">
+  <button class="btn btn-default btn-xs dropdown-toggle" type="button" data-toggle="dropdown">
+    Extra small button <span class="caret"></span>
+  </button>
+  <ul class="dropdown-menu">
+    ...
+  </ul>
 </div>
 {% endhighlight %}