fixes #10396: mention table class change in migration docs

getting-started.html

@@ -438,6 +438,10 @@ bootstrap/
             <td><code>.text-error</code></td>
             <td><code>.text-danger</code></td>
           </tr>
+          <tr>
+            <td><code>.table .error</code></td>
+            <td><code>.table .danger</code></td>
+          </tr>
           <tr>
             <td><code>.bar</code></td>
             <td><code>.progress-bar</code></td>