Update progressbar

there is no gradient in 3.x

components.html

@@ -2016,7 +2016,7 @@ body { padding-bottom: 70px; }
     </div>
 
     <h3 id="progress-basic">Basic example</h3>
-    <p>Default progress bar with a vertical gradient.</p>
+    <p>Default progress bar.</p>
     <div class="bs-example">
       <div class="progress">
         <div class="progress-bar" role="progressbar" aria-valuenow="60" aria-valuemin="0" aria-valuemax="100" style="width: 60%;"><span class="sr-only">60% Complete</span></div>