Revert "Add note about non-Windows OS"

[gewarren]

Reverts #6944. Need to hold off on merging that change until dotnet/docs#25367 is merged.

[opbld33]

Docs Build status updates of commit 29a41fd:

✅ Validation status: passed

File	Status	Preview URL	Details
includes/system-drawing-common.md	✅Succeeded
xml/System.Drawing.Drawing2D/AdjustableArrowCap.xml	✅Succeeded	View
xml/System.Drawing.Drawing2D/CustomLineCap.xml	✅Succeeded	View
xml/System.Drawing.Drawing2D/GraphicsPath.xml	✅Succeeded	View
xml/System.Drawing.Drawing2D/GraphicsPathIterator.xml	✅Succeeded	View
xml/System.Drawing.Drawing2D/GraphicsState.xml	✅Succeeded	View
xml/System.Drawing.Drawing2D/HatchBrush.xml	✅Succeeded	View
xml/System.Drawing.Drawing2D/LinearGradientBrush.xml	✅Succeeded	View
xml/System.Drawing.Drawing2D/Matrix.xml	✅Succeeded	View
xml/System.Drawing.Drawing2D/PathGradientBrush.xml	✅Succeeded	View
xml/System.Drawing.Imaging/Encoder.xml	✅Succeeded	View
xml/System.Drawing.Imaging/EncoderParameter.xml	✅Succeeded	View
xml/System.Drawing.Imaging/EncoderParameters.xml	✅Succeeded	View
xml/System.Drawing.Imaging/ImageAttributes.xml	✅Succeeded	View
xml/System.Drawing.Imaging/ImageCodecInfo.xml	✅Succeeded	View
xml/System.Drawing.Imaging/ImageFormat.xml	✅Succeeded	View
xml/System.Drawing.Imaging/Metafile.xml	✅Succeeded	View
xml/System.Drawing.Imaging/MetafileHeader.xml	✅Succeeded	View
xml/System.Drawing.Imaging/PlayRecordCallback.xml	✅Succeeded	View
xml/System.Drawing.Printing/PageSettings.xml	✅Succeeded	View
xml/System.Drawing.Printing/PreviewPageInfo.xml	✅Succeeded	View
xml/System.Drawing.Printing/PrintController.xml	✅Succeeded	View
xml/System.Drawing.Printing/PrintDocument.xml	✅Succeeded	View
xml/System.Drawing.Printing/PrintEventArgs.xml	✅Succeeded	View
xml/System.Drawing.Printing/PrintEventHandler.xml	✅Succeeded	View
xml/System.Drawing.Printing/PrintPageEventArgs.xml	✅Succeeded	View
xml/System.Drawing.Printing/PrintPageEventHandler.xml	✅Succeeded	View
xml/System.Drawing.Printing/PrinterSettings.xml	✅Succeeded	View
xml/System.Drawing.Text/FontCollection.xml	✅Succeeded	View
xml/System.Drawing.Text/InstalledFontCollection.xml	✅Succeeded	View
xml/System.Drawing.Text/PrivateFontCollection.xml	✅Succeeded	View
xml/System.Drawing/Bitmap.xml	✅Succeeded	View
xml/System.Drawing/Brush.xml	✅Succeeded	View
xml/System.Drawing/Brushes.xml	✅Succeeded	View
xml/System.Drawing/BufferedGraphics.xml	✅Succeeded	View
xml/System.Drawing/BufferedGraphicsContext.xml	✅Succeeded	View
xml/System.Drawing/Font.xml	✅Succeeded	View
xml/System.Drawing/FontConverter.xml	✅Succeeded	View
xml/System.Drawing/FontFamily.xml	✅Succeeded	View
xml/System.Drawing/Graphics.xml	✅Succeeded	View
xml/System.Drawing/Icon.xml	✅Succeeded	View
xml/System.Drawing/IconConverter.xml	✅Succeeded	View
xml/System.Drawing/Image.xml	✅Succeeded	View
xml/System.Drawing/ImageAnimator.xml	✅Succeeded	View
xml/System.Drawing/Pen.xml	✅Succeeded	View
xml/System.Drawing/Pens.xml	✅Succeeded	View
xml/System.Drawing/Region.xml	✅Succeeded	View
xml/System.Drawing/SolidBrush.xml	✅Succeeded	View
xml/System.Drawing/StringFormat.xml	✅Succeeded	View
xml/System.Drawing/SystemBrushes.xml	✅Succeeded	View

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