[quicwg/base-drafts] Only send one immediate ACK after reordering (#3357)

[ianswett <[e-mail]>]

Currently the transport draft says:

> "In order to assist loss detection at the sender, an endpoint SHOULD send an ACK frame immediately on receiving an ack-eliciting packet that is out of order. The endpoint MAY continue sending ACK frames immediately on each subsequently received packet, but the endpoint SHOULD return to acknowledging every other packet within a period of 1/8 x RTT, unless more ack-eliciting packets are received out of order. If every subsequent ack-eliciting packet arrives out of order, then an ACK frame SHOULD be sent immediately for every received ack-eliciting packet."

However, since this text was written, recovery was changed to require packet AND time threshold loss detection, so the only time sending multiple immediate ACKs for a single missing packet would be beneficial is if the first ACK is lost.

Also, only sending 1 immediate ACK is a lot easier to implement and reason about in my opinion than "up to 1/8 RTT".

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