Changing 'navbar-brand' to 'navbar' (#838)

navbar-menu can't be direct child and sibling of navbar-brand at the same time

docs/documentation/components/navbar.html

@@ -501,7 +501,7 @@ doc-subtab: navbar
 
     <div class="content">
       <p>
-        The <code>navbar-menu</code> is the <strong>counterpart</strong> of the navbar brand. As such, it must appear as a direct child of <code>navbar-brand</code>, as a sibling of <code>navbar-brand</code>.
+        The <code>navbar-menu</code> is the <strong>counterpart</strong> of the navbar brand. As such, it must appear as a direct child of <code>navbar</code>, as a sibling of <code>navbar-brand</code>.
       </p>
     </div>