20220923 add bdc article to TOC

Author: WilliamDAssafMSFT

docs/toc.yml

@@ -10410,6 +10410,8 @@ items:
         href: big-data-cluster/deployment-custom-configuration.md
       - name: Configure storage
         href: big-data-cluster/concept-data-persistence.md
+      - name: Configure Apache Spark
+        href: big-data-cluster/configure-spark-hdfs.md
       - name: Offline deployments
         href: big-data-cluster/deploy-offline.md
       - name: Deploy with high availability