Changed nav-header to dropdown-header in navbar navbar-fixed-top and...

Changed nav-header to dropdown-header in navbar navbar-fixed-top and navbar-static-top as mentioned in Docs

navbar-fixed-top/index.html

@@ -38,7 +38,7 @@
                 <li><a href="#">Another action</a></li>
                 <li><a href="#">Something else here</a></li>
                 <li class="divider"></li>
-                <li class="nav-header">Nav header</li>
+                <li class="dropdown-header">Dropdown header</li>
                 <li><a href="#">Separated link</a></li>
                 <li><a href="#">One more separated link</a></li>
               </ul>

navbar-static-top/index.html

@@ -38,7 +38,7 @@
                 <li><a href="#">Another action</a></li>
                 <li><a href="#">Something else here</a></li>
                 <li class="divider"></li>
-                <li class="nav-header">Nav header</li>
+                <li class="dropdown-header">Dropdown header</li>
                 <li><a href="#">Separated link</a></li>
                 <li><a href="#">One more separated link</a></li>
               </ul>

navbar/index.html

@@ -40,7 +40,7 @@
                   <li><a href="#">Another action</a></li>
                   <li><a href="#">Something else here</a></li>
                   <li class="divider"></li>
-                  <li class="nav-header">Nav header</li>
+                  <li class="dropdown-header">Dropdown header</li>
                   <li><a href="#">Separated link</a></li>
                   <li><a href="#">One more separated link</a></li>
                 </ul>