Port #14654 over to hosted docs

javascript/index.html

@@ -726,6 +726,11 @@
 
   <h2 id="scrollspy-usage">Usage</h2>
 
+  <div class="bs-callout bs-callout-warning">
+    <h4>Requires Bootstrap nav</h4>
+    <p>Scrollspy currently requires the use of a <a href="../components/#nav">Bootstrap nav component</a> for proper highlighting of active links.</p>
+  </div>
+
   <h3>Requires relative positioning</h3>
   <p>No matter the implementation method, scrollspy requires the use of <code>position: relative;</code> on the element you're spying on. In most cases this is the <code>&lt;body&gt;</code>.</p>