Tiny remove outdated comments (#130387)

I get confused when reading this comment. It seems that this code never calls `AnimationController.fling` (but only things like `animateTo`). Therefore, I do not think discussing the duration of `AnimationController.fling` is helpful - maybe it is just an outdated comment?
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fzyzcjy 2023-08-03 00:21:54 +08:00 committed by GitHub
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@ -724,8 +724,6 @@ class _CupertinoBackGestureController<T> {
/// [fractionalVelocity] as a fraction of screen width per second.
void dragEnd(double velocity) {
// Fling in the appropriate direction.
// AnimationController.fling is guaranteed to
// take at least one frame.
//
// This curve has been determined through rigorously eyeballing native iOS
// animations.