end of setValueCurveAtTime range should be exclusive for cancelScheduledValues()

[karlt]

		For a {{AudioParam/setValueCurveAtTime()}}, let \(T_0\) and \(T_D\) be the corresponding 
		{{AudioParam/setValueCurveAtTime()/startTime!!argument}} and {{AudioParam/setValueCurveAtTime()/duration!!argument}}, respectively of this event.
		Then if {{AudioParam/cancelScheduledValues()/cancelTime!!argument}}
		is in the range \([T_0, T_0 + T_D]\), the event is
		removed from the timeline.

in https://webaudio.github.io/web-audio-api/#dom-audioparam-cancelscheduledvalues I think was intended to clarify "Any active automations whose automation event time is less than cancelTime are also cancelled" because he said "make it explicit that if the cancel time is in the middle of the curve", and that is what he tested.

The curve automation is no longer active at T_0 + T_D.

So the range should be [T_0, T_0 + T_D).

[karlt]

The start of the range does not add information.
Clearer would be to say that the event is removed if cancelTime is strictly less than T_0 + T_D.