Fixed error

Author: sunasing

articles/industry/agriculture/toc.yml

@@ -39,6 +39,7 @@
      href: troubleshoot-azure-farmbeats.md
 - name: Reference
   items:
-  href: references-for-azure-farmbeats.md
+   - name: Reference
+     href: references-for-azure-farmbeats.md
    - name: REST API
      href: rest-api-in-azure-farmbeats.md