updating toc

Author: aahill

articles/ai-services/openai/toc.yml

@@ -213,11 +213,11 @@ items:
           href: ./references/azure-search.md
         - name: Data source - Azure Cosmos DB for MongoDB vCore
           href: ./references/cosmos-db.md
-        - name: Data source - Azure Machine Learning index
+        - name: Data source - Azure Machine Learning index (preview)
           href: ./references/azure-machine-learning.md
-        - name: Data source - Elasticsearch
+        - name: Data source - Elasticsearch (preview)
           href: ./references/elasticsearch.md
-        - name: Data source - Pinecone
+        - name: Data source - Pinecone (preview)
           href: ./references/pinecone.md
         - name: Ingestion API (preview)
           href: /rest/api/azureopenai/ingestion-jobs