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

[Jana Iyengar <[e-mail]>]

@janaiyengar 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.

The description of the delay is already in the host delay section. We can fix that section if necessary, but let's not repeat the same text down here.

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