update nav for getting started migration

_includes/nav-getting-started.html

@@ -19,7 +19,13 @@
   <a href="#disable-responsive">Disabling responsiveness</a>
 </li>
 <li>
-  <a href="#migration">Migration</a>
+  <a href="#migration">Migrating from 2.x to 3.0</a>
+  <ul class="nav">
+    <li><a href="#migration-classes">Major class changes</a></li>
+    <li><a href="#migration-new">What's new</a></li>
+    <li><a href="#migration-dropped">What's removed</a></li>
+    <li><a href="#migration-notes">Additional notes</a></li>
+  </ul>
 </li>
 <li>
   <a href="#browsers">Browser support</a>

getting-started.html

@@ -324,11 +324,11 @@ bootstrap/
   ================================================== -->
   <div class="bs-docs-section">
     <div class="page-header">
-      <h1 id="migration">Migration</h1>
+      <h1 id="migration">Migrating from 2.x to 3.0</h1>
     </div>
     <p class="lead">We've put together a helpful guide that outlines some of the key changes from Bootstrap 2.x to 3.0.</p>
 
-    <h3 id="migration-clases">Major class changes</h3>
+    <h3 id="migration-classes">Major class changes</h3>
     <p></p>
     <table class="table table-bordered table-striped">
       <thead>
@@ -441,6 +441,7 @@ bootstrap/
       </tbody>
     </table>
 
+
     <h3 id="migration-new">What's new</h3>
     <p>We've added a few new elements and changed some existing ones. Here's their new or updated classes.</p>
     <table class="table table-bordered table-striped">
@@ -554,7 +555,7 @@ bootstrap/
       </tbody>
     </table>
 
-    <h3 id="migration-dropped">What's been removed</h3>
+    <h3 id="migration-dropped">What's removed</h3>
     <p>The following elements have been dropped or changed in v3.</p>
     <table class="table table-bordered table-striped bs-table">
       <thead>