Merge pull request #2438 from trympet/patch-1

Document exception if surface creation fails due to unsupported pixel format

Author: jwmsft

windows.ui.composition/compositiongraphicsdevice_createdrawingsurface2_1137892861.md

@@ -29,6 +29,7 @@ The alpha mode of the drawing surface.
 Returns the created CompositionDrawingSurface.
 
 ## -remarks
+If the requested pixel format is unsupported by the graphics device, an exception will be thrown.
 
 ## -see-also
 

windows.ui.composition/compositiongraphicsdevice_createdrawingsurface_428570653.md

@@ -28,6 +28,7 @@ How the alpha channel should be handled.
 The created [CompositionDrawingSurface](compositiondrawingsurface.md).
 
 ## -remarks
+If the requested pixel format is unsupported by the graphics device, an exception will be thrown.
 
 ## -examples