removing empty node in TOC

Author: EMaher

articles/lab-services/TOC.yml

@@ -82,7 +82,6 @@
     href: lab-services-within-canvas-overview.md
   - name: Use Lab Services within Teams
     href: lab-services-within-teams-overview.md
-  - name: Lab class types
 - name: How-tos
   items:
   - name: Administrator guide