Update ToC with Transformer

PiperOrigin-RevId: 472588475

Author: 8bitmp3

site/en/tutorials/_toc.yaml

@@ -124,15 +124,18 @@ toc:
   - title: "Text classification with an RNN"
     path: /text/tutorials/text_classification_rnn
     status: external
-  - title: "Classify Text with BERT"
+  - title: "Classify text with BERT"
     path: /text/tutorials/classify_text_with_bert
     status: external
   - title: "Solve GLUE tasks using BERT on TPU"
     path: /text/tutorials/bert_glue
     status: external
-  - title: "Neural machine translation with attention"
+  - title: "Translation with RNNs and attention"
     path: /text/tutorials/nmt_with_attention
     status: external
+  - title: "Translate text with a Transfromer"
+    path: /text/tutorials/transformer
+    status: external
   - title: "Image captioning"
     path: /tutorials/text/image_captioning