Fix link to App Service

Author: johndowns

articles/azure-monitor/app/sampling.md

@@ -414,7 +414,7 @@ Like other types of sampling, the algorithm retains related telemetry items. For
 
 Data points that are discarded by sampling are not available in any Application Insights feature such as [Continuous Export](../../azure-monitor/app/export-telemetry.md).
 
-Ingestion sampling doesn't operate while adaptive or fixed-rate sampling is in operation. Adaptive sampling is enabled by default when the ASP.NET SDK or the ASP.NET Core SDK is being used, or when Application Insights is enabled in Azure App Service extensions (TODO) or by using Status Monitor. When telemetry is received by the Application Insights service endpoint, it examines the telemetry and if the sampling rate is reported to be less than 100% (which indicates that telemetry is being sampled) then the ingestion sampling rate that you set is ignored.
+Ingestion sampling doesn't operate while adaptive or fixed-rate sampling is in operation. Adaptive sampling is enabled by default when the ASP.NET SDK or the ASP.NET Core SDK is being used, or when Application Insights is enabled in [Azure App Service ](azure-web-apps.md) or by using Status Monitor. When telemetry is received by the Application Insights service endpoint, it examines the telemetry and if the sampling rate is reported to be less than 100% (which indicates that telemetry is being sampled) then the ingestion sampling rate that you set is ignored.
 
 > [!WARNING]
 > The value shown on the portal tile indicates the value that you set for ingestion sampling. It doesn't represent the actual sampling rate if any sort of SDK sampling (adaptive or fixed-rate sampling) is in operation.