Update appcontextswitchoverrides-element.md (dotnet#25376)

Fixes dotnet#21377

Author: BenjaminMichaelis

docs/framework/configure-apps/file-schema/runtime/appcontextswitchoverrides-element.md

@@ -99,7 +99,7 @@ Defines one or more switches used by the <xref:System.AppContext> class to provi
 |`Switch.System.Security.Cryptography.Xml.`<br/>`UseInsecureHashAlgorithms`|Determines whether the default for some SignedXML operations is SHA1 or SHA256.<br>Due to collision problems with SHA1, Microsoft recommends SHA256.|.NET Framework 4.7.1|
 |`Switch.System.ServiceModel.`<br/>`AllowUnsignedToHeader`|Determines whether the `TransportWithMessageCredential` security mode allows messages with an unsigned "to" header. This is an opt-in switch. For more information, see [Runtime Changes in the .NET Framework 4.6.1](../../../migration-guide/runtime/4.5.2-4.6.1.md#windows-communication-foundation-wcf).|.NET Framework 4.6.1|
 |`Switch.System.ServiceModel.`<br/>`DisableAddressHeaderCollectionValidation`>|Controls whether the <xref:System.ServiceModel.Channels.AddressHeaderCollection.%23ctor(System.Collections.Generic.IEnumerable{System.ServiceModel.Channels.AddressHeader})> constructor throws an <xref:System.ArgumentException> if one of the elements is `null`.|.NET Framework 4.7.1|
-|`Switch.System.ServiceModel.`<br />`DisableCngCertificates`|Determines whether the attempt to use X509 certificates with a CSG key storage provider throws an exception. For more information, see [WCF transport security supports certificates stored using CNG](../../../migration-guide/retargeting/4.6.1-4.6.2.md#wcf-transport-security-supports-certificates-stored-using-cng).|.NET Framework 4.6.1|
+|`Switch.System.IdentityModel.`<br />`DisableCngCertificates`|Determines whether the attempt to use X509 certificates with a CSG key storage provider throws an exception. For more information, see [WCF transport security supports certificates stored using CNG](../../../migration-guide/retargeting/4.6.1-4.6.2.md#wcf-transport-security-supports-certificates-stored-using-cng).|.NET Framework 4.6.1|
 |`Switch.System.ServiceModel.`<br/>`DisableExplicitConnectionCloseHeader`|When using the HTTP transport with a self-hosted service, setting this value to `true` causes WCF to ignore an application adding the `Connection: close` header to the response headers for a request. Setting this value to `false` enables adding the `Connection: close` header to the response headers, which results in closing the request socket after a response has been sent.|.NET Framework 4.6|
 |`Switch.System.ServiceModel.`<br/>`DisableOperationContextAsyncFlow`|Handles deadlocks that result from restricting instances of a re-entrant service to a single thread of execution at a time.|.NET Framework 4.6.2|
 |`Switch.System.ServiceModel.`<br/>`DisableUsingServicePointManagerSecurityProtocols`|Along with `Switch.System.Net.DontEnableSchUseStrongCrypto`, determines whether WCF message security uses TLS 1.1 and TLS 1.2.|.NET Framework 4.7 |