fixes #10277: Mention removal of navbar vertical dividers in migration docs

getting-started.html

@@ -592,6 +592,11 @@ bootstrap/
             <td><code>.navbar-inner</code></td>
             <td class="text-muted">N/A</td>
           </tr>
+          <tr>
+            <td>Navbar vertical dividers</td>
+            <td><code>.navbar .divider-vertical</code></td>
+            <td class="text-muted">N/A</td>
+          </tr>
           <tr>
             <td>Dropdown submenu</td>
             <td><code>.dropdown-submenu</code></td>