Merge pull request #192765 from baanders/3-24-learn

ADT: Add Learn module to TOC

Author: v-regandowner

articles/digital-twins/TOC.yml

@@ -321,6 +321,8 @@
       href: https://github.com/Azure/digital-twin-model-identifier
   - name: 'Microsoft Learn: Extend IoT solutions by using Azure Digital Twins'
     href: /learn/paths/extend-iot-solutions-by-using-azure-digital-twins/
+  - name: 'Microsoft Learn: Set up a mixed reality project for Azure Digital Twins in Unity'
+    href: /learn/modules/set-up-mixed-reality-azure-digital-twins-unity/
   - name: Customer stories
     href: https://customers.microsoft.com/en-us/search?sq=%22Azure%20Digital%20Twins%22&ff=&p=0&so=story_publish_date%20desc
   - name: Azure tools