Re: [quicwg/base-drafts] Clarify ACK Delay and reference host-delay (#3971)

[ianswett <[e-mail]>]

@ianswett commented on this pull request.



> +: A variable-length integer encoding the intentional delay between when the
+  largest acknowledged packet, as indicated in the Largest Acknowledged field,
+  was received, and when the ACK frame was sent; see {{host-delay}}.
+  The acknowledgement delay in microseconds is the value of the ACK Delay
+  field multiplied by 2 to the power of the ack_delay_exponent transport
+  parameter sent by the sender of the ACK frame;
+  see {{transport-parameter-definitions}}.  Scaling in this fashion allows for
+  a larger range of values with a shorter encoding at the cost of lower
+  resolution.  Because the receiver doesn't use the ACK Delay for Initial and
+  Handshake packets, a sender SHOULD send a value of 0.

Thanks, I kept most of the existing sentence about size vs resolution, but otherwise took your suggestion @janaiyengar 

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