Update index.yml

As a courtesy, made "ARM template" lowercase in line 103 per MS style.

Author: denrea

articles/load-balancer/index.yml

@@ -100,7 +100,7 @@ landingContent:
             url: https://docs.microsoft.com/powershell/module/az.network/?view=azps-2.5.0#load_balancer
           - text: Azure CLI
             url: https://docs.microsoft.com/cli/azure/network/lb?view=azure-cli-latest
-          - text: ARM Templates
+          - text: ARM templates
             url: https://docs.microsoft.com/azure/templates/microsoft.network/loadbalancers#quickstart-templates
           - text: Frequently asked Load Balancer questions
             url: load-balancer-faqs.md