"Stride" is undefined on BitmapSource.CopyPixels

https://docs.microsoft.com/en-us/dotnet/api/system.windows.media.imaging.bitmapsource.copypixels keeps referring to the "stride" of the bitmap, but does not link to a definition or define the term itself.

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* ID: 6af581ea-97d5-6dd3-dbd8-5968702a24ce
* Version Independent ID: 681ffd65-1d5c-b6de-d212-c4cc90a9232b
* Content: [BitmapSource.CopyPixels Method (System.Windows.Media.Imaging)](https://docs.microsoft.com/en-us/dotnet/api/system.windows.media.imaging.bitmapsource.copypixels?view=netframework-4.7.2#System_Windows_Media_Imaging_BitmapSource_CopyPixels_System_Array_System_Int32_System_Int32_)
* Content Source: [xml/System.Windows.Media.Imaging/BitmapSource.xml](https://github.com/dotnet/dotnet-api-docs/blob/master/xml/System.Windows.Media.Imaging/BitmapSource.xml)
* Product: **.net**
* GitHub Login: @dotnet-bot
* Microsoft Alias: **dotnetcontent**