cross linking cognitive search + mysql tutorial

Author: mksuni

articles/mysql/TOC.yml

@@ -144,6 +144,8 @@
       href: flexible-server/tutorial-add-redis-to-mysql.md
     - name: Azure Logic Apps
       href: flexible-server/tutorial-logic-apps-with-mysql.md
+    - name: Azure Cognitive Search
+      href: ../search/search-create-service-portal.md
     - name: Azure advisor
       href: ../mysql/single-server/concepts-azure-advisor-recommendations.md
     - name: Azure Data factory