fix(doc): scrollspy

using navbar-dark and navbar-nav navs

docs/components/scrollspy.md

@@ -14,9 +14,9 @@ group: components
 The ScrollSpy plugin is for automatically updating nav targets based on scroll position. Scroll the area below the navbar and watch the active class change. The dropdown sub items will be highlighted as well.
 
 <div class="bd-example">
-  <nav id="navbar-example2" class="navbar navbar-default">
+  <nav id="navbar-example2" class="navbar navbar-dark">
     <h3 class="navbar-brand">Project Name</h3>
-    <ul class="nav nav-pills">
+    <ul class="nav navbar-nav">
       <li class="nav-item"><a class="nav-link" href="#fat">@fat</a></li>
       <li class="nav-item"><a class="nav-link" href="#mdo">@mdo</a></li>
       <li class="nav-item dropdown">