fix link

Author: EdB-MSFT

articles/azure-monitor/logs/api/register-app-for-token.md

@@ -115,7 +115,7 @@ For example,
 
 - To grant access to send custom metrics for a resource,  add your app as a member to the **Monitoring Metrics Publisher** role using Access control (IAM) for your resource. For more information, see [ Send metrics to the Azure Monitor metric database using REST API](../../essentials/metrics-store-custom-rest-api.md)
 
-For more information, see [Assign Azure roles using the Azure portal](../../../role-based-access-control/role-assignments-portal)
+For more information, see [Assign Azure roles using the Azure portal](../../../role-based-access-control/role-assignments-portal.md)
 
 Once you've assigned a role, you can use your app, client ID, and client secret to generate a bearer token to access the REST API.