Update samples link

Author: ntrogh

articles/load-testing/toc.yml

@@ -113,7 +113,7 @@ items:
     - name: Regional availability
       href: https://azure.microsoft.com/explore/global-infrastructure/products-by-region/?products=load-testing
     - name: Samples
-      href: /samples/?product=azure-load-testing
+      href: /samples/?expanded=azure&products=azure-load-testing
     - name: Supported Azure resource types
       href: resource-supported-azure-resource-types.md
     - name: Service limits