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Update dragDevices doc to include default PointerDeviceKind.trackpad (#163898 )

[ScrollBehavior.dragDevices](https://api.flutter.dev/flutter/widgets/ScrollBehavior/dragDevices.html)
docs say

> By default only PointerDeviceKind.touch, PointerDeviceKind.stylus, and
PointerDeviceKind.invertedStylus are configured to create drag gestures.

However, `PointerDeviceKind.trackpad` is also included by default
https://github.com/flutter/flutter/pull/89944/


401ab831ee/packages/flutter/lib/src/widgets/scroll_configuration.dart (L115-L119)


401ab831ee/packages/flutter/lib/src/widgets/scroll_configuration.dart (L33)

Update the comment to include `trackpad`:
> By default only PointerDeviceKind.touch, PointerDeviceKind.stylus,
PointerDeviceKind.invertedStylus, **and PointerDeviceKind.trackpad** are
configured to create drag gestures.



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