fix link

Author: cebundy

articles/azure-web-pubsub/howto-monitor-azure-policy.md

@@ -18,7 +18,7 @@ This article describes the built-in policies for Azure Web PubSub Service.
 ## Built-in policy definitions
 
 
-The following table contains an index of Azure Policy built-in policy definitions for Azure Web PubSub. For Azure Policy built-ins for other services, see [Azure Policy built-in definitions](../governance/policy/samples/built-in-policies).
+The following table contains an index of Azure Policy built-in policy definitions for Azure Web PubSub. For Azure Policy built-ins for other services, see [Azure Policy built-in definitions](../governance/policy/samples/built-in-policies.md).
 
 The name of each built-in policy definition links to the policy definition in the Azure portal. Use the link in the Version column to view the source on the [Azure Policy GitHub repo](https://github.com/Azure/azure-policy).