System.Windows.SystemColors useless in Windows 10?

System.Windows.SystemColors does not seem to be relevant any more. The colors do not correspond to the colors being used by Windows 10, and cannot be adjusted by the user like in previous Windows versions. Some note on this in the documentation, and guidance of how to make our desktop apps match the Windows 10 environment, would be helpful.

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#### Document Details

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* ID: 7c7217e4-be84-2cb1-29f3-922adec733c1
* Version Independent ID: 39615b43-eef1-51f9-b88c-cb1b106762a0
* Content: [SystemColors Class (System.Windows)](https://docs.microsoft.com/en-us/dotnet/api/system.windows.systemcolors?view=netframework-4.7.1)
* Content Source: [xml/System.Windows/SystemColors.xml](https://github.com/dotnet/dotnet-api-docs/blob/master/xml/System.Windows/SystemColors.xml)
* Service: **unspecified**
* Product: **.net**
* GitHub Login: @dotnet-bot
* Microsoft Alias: **dotnet-bot**

Inizia con xml/System.Windows/SystemColors.xml e confronta la documentazione attuale di SystemColors Class collegata nell’issue. Determina quale nota sulla rilevanza di Windows 10 e quali indicazioni per adattarsi all’ambiente desktop possono essere supportate, quindi aggiorna la documentazione e verifica il riferimento API renderizzato.

Scritto dal modello di indicizzazione a partire dal testo della issue.