update toc

Author: mrbullwinkle

articles/cognitive-services/openai/toc.yml

@@ -38,6 +38,10 @@ items:
       href: ./how-to/integrate-synapseml.md
     - name: Business continuity & disaster recovery (BCDR)
       href: ./how-to/business-continuity-disaster-recovery.md
+- name: Tutorials
+  items:
+    - name: Embeddings
+      href: ./tutorials/embeddings.md
 - name: Responsible AI
   items:
     - name : Transparency note