Merge pull request #312183 from dominicbetts/iot-fundamentals-review

IoT: Proposal for Intro updates

Author: v-ccolin

articles/iot/TOC.yml

@@ -9,6 +9,8 @@ items:
   href: iot-overview-security.md
 - name: Choose an Azure IoT service
   href: iot-services-and-technologies.md
+- name: IoT device development
+  href: iot-overview-device-development.md
 - name: Deliver industrial solutions
   items:
   - name: Implement industrial IoT reference solution