Update articles/application-gateway/configuration-overview.md

Co-Authored-By: Vic <[email protected]>

Author: surajmb

articles/application-gateway/configuration-overview.md

@@ -302,7 +302,7 @@ This setting associates a [custom probe](https://docs.microsoft.com/azure/applic
 > [!NOTE]
 > The custom probe doesn't monitor the health of the back-end pool unless the corresponding HTTP setting is explicitly associated with a listener.
 
-### Pick host name from back-end address
+### <a id="pick"/></a>Pick host name from back-end address
 
 This capability dynamically sets the *host* header in the request to the host name of the back-end pool. It uses an IP address or FQDN.