Update application-gateway-metrics.md

Author: tobystic

articles/application-gateway/application-gateway-metrics.md

@@ -190,7 +190,7 @@ For Application Gateway, the following metrics are available:
 
 ### Web Application Firewall (WAF) metrics
 
-For information on WAF Monitoring, see [WAF v1 Metrics](../../articles/web-application-firewall/ag/application-gateway-waf-metrics.md#metrics-supported-by-application-gateway-v1-sku)
+For information on WAF Monitoring, see [WAF v1 Metrics](../../articles/web-application-firewall/ag/application-gateway-waf-metrics.md#application-gateway-waf-v1-metrics)
 
 ## Metrics visualization