Fix advanced settings overview path in TOC

Author: alvinashcraft

hub/dev-environment/toc.yml

@@ -4,7 +4,7 @@ items:
 - name: Advanced Windows Settings
   items:
     - name: Overview
-      href: ../advanced-settings/
+      href: ../advanced-settings/index.md
     - name: File Explorer source control integration
       href: ../advanced-settings/source-control-integration.md
 - name: Dev Drive