fix toc

Author: anaharris-ms

articles/reliability/TOC.yml

@@ -2,12 +2,6 @@
   href: index.yml
 - name: Overview
   href: overview.md
-  items:
-  - name: What are Azure availability zones?
-    href: availability-zones-overview.md
-  - name: Services with availability zone support
-    href: availability-zones-service-support.md
-  - name: Migrate to availability zone support
     items:
     - name: Overview
       href: availability-zones-migration-overview.md