fixed an issue

Author: spelluru

articles/lab-services/classroom-labs/TOC.yml

@@ -4,10 +4,10 @@
   href: ../devtest-lab-overview.md
 - name: Overview
   items:
-  - name: About Lab Services and DevTest Labs 
-    href: ../lab-services-overview.md?toc=%2fazure%2fevent-grid%2fclassroom-labs%2ftoc.json
   - name: About Classroom Labs
     href: classroom-labs-overview.md
+  - name: About Lab Services and DevTest Labs 
+    href: ../lab-services-overview.md?toc=%2fazure%2flab-services%2fclassroom-labs%2ftoc.json
 - name: Tutorials
   items:
   - name: Set up a lab account