DuplexClientBase<TChannel> does not appear in the "Example" for DuplexClientBase<TChannel>

The example at https://docs.microsoft.com/en-us/dotnet/api/system.servicemodel.duplexclientbase-1?view=netframework-4.7.2 shows how to use a "SampleDuplexHelloCallback" class, which presumably itself makes use of DuplexClientBase<TChannel>.

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• ID: a60284ae-8d43-9d2c-be33-34e9bde0f10a
• Version Independent ID: 8195dc1f-7662-c1b4-f423-f908b92b410e
• Content: DuplexClientBase<TChannel> Class (System.ServiceModel)
• Content Source: [xml/System.ServiceModel/DuplexClientBase1.xml](https://github.com/dotnet/dotnet-api-docs/blob/master/xml/System.ServiceModel/DuplexClientBase1.xml)
• Product: dotnet-api
• GitHub Login: @dotnet-bot
• Microsoft Alias: dotnetcontent

Inizia con xml/System.ServiceModel/DuplexClientBase`1.xml e confronta il relativo contenuto di Example con la pagina API collegata di DuplexClientBase. Conferma come viene presentato l’esempio SampleDuplexHelloCallback, quindi aggiorna la documentazione in modo che l’utilizzo di DuplexClientBase sia rappresentato nell’esempio e verifica la pagina renderizzata.