Merge pull request #190188 from timlt/fix-dev-toc

Update toc entry

Author: denrea

articles/iot-develop/TOC.yml

@@ -91,8 +91,8 @@
       href: concepts-digital-twin.md
     - name: IoT Plug and Play bridge
       href: concepts-iot-pnp-bridge.md
-- name: Security
-  items:
+  - name: Security
+    items:
     - name: Guidelines for secured embedded development
       href: concepts-azure-rtos-security-practices.md 
 - name: How to