Add a migration tip for .label to .label-default

getting-started.html

@@ -456,6 +456,10 @@ bootstrap/
             <td><code>.muted</code></td>
             <td><code>.text-muted</code></td>
           </tr>
+          <tr>
+            <td><code>.label</code></td>
+            <td><code>.label .label-default</code></td>
+          </tr>
           <tr>
             <td><code>.text-error</code></td>
             <td><code>.text-danger</code></td>