fix val warn3

Author: rmca14

articles/azure-monitor/platform/app-insights-metrics.md

@@ -220,7 +220,7 @@ exceptions
 
 ### Failed requests (requests/failed)
 
-The count of tracked server requests that were marked as *failed*. By default, the Application Insights SDK automatically marks each server request that returned HTTP response code 5xx or 4xx as a failed request. You can customize this logic by modifying  *success* property of request telemetry item in a [custom telemetry initializer](../../azure-monitor/app/api-filtering-sampling.md#add/modify-properties:-itelemetryinitializer).
+The count of tracked server requests that were marked as *failed*. By default, the Application Insights SDK automatically marks each server request that returned HTTP response code 5xx or 4xx as a failed request. You can customize this logic by modifying  *success* property of request telemetry item in a [custom telemetry initializer](../../azure-monitor/app/api-filtering-sampling.md#addmodify-properties-itelemetryinitializer).
 
 |Unit of measure|Supported aggregations|Pre-aggregated dimensions|Notes|
 |---|---|---|---|