Links for SystemParametersInfo and HighContrast are incorrect

The two links go to old msdn documents that are no longer available (at least with the URLs used). It redirects to a default page.

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#### Document Details

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* ID: 032963c5-0d63-2bb6-dbb6-07659467269e
* Version Independent ID: 679f8bb0-076c-b0f9-63be-94a7ec75eae1
* Content: [SystemParameters.HighContrast Property (System.Windows)](https://docs.microsoft.com/en-us/dotnet/api/system.windows.systemparameters.highcontrast?view=netframework-4.7.2)
* Content Source: [xml/System.Windows/SystemParameters.xml](https://github.com/dotnet/dotnet-api-docs/blob/master/xml/System.Windows/SystemParameters.xml)
* Product: **dotnet-api**
* GitHub Login: @dotnet-bot
* Microsoft Alias: **dotnetcontent**