sync: Made doc comment on Gate.Close make more sense

sync/gate.go

@@ -51,7 +51,7 @@ func (this *Gate[T]) Receive () <- chan T {
 	return this.load()
 }
 
-// Close closes the gate, drains all remaining messages, and closes the channel.
+// Close closes the gate, unblocking any send or receive operations.
 func (this *Gate[T]) Close () error {
 	channel := this.channel.Swap((chan T)(nil)).(chan T)
 	if channel == nil { return ErrAlreadyClosed }