Updated broken links with correct links

PiperOrigin-RevId: 428859628

Author: tensorflower-gardener

site/en/tutorials/_index.yaml

@@ -132,8 +132,8 @@ landing_page:
       - description: >
           <a href="/tensorboard"><h3 class="tfo-landing-page-heading no-link">TensorBoard</h3></a>
           <ul class="tfo-landing-page-resources-ul">
-          <li><a href="/tensorboard/r2/get_started">Get started with TensorBoard</a></li>
-          <li><a href="/tensorboard/r2/scalars_and_keras">Logging training metrics in Keras</a></li>
+          <li><a href="/tensorboard/get_started">Get started with TensorBoard</a></li>
+          <li><a href="/tensorboard/scalars_and_keras">Logging training metrics in Keras</a></li>
           </ul>
         path: /tensorboard
         icon: