Revert "Improve description of max_ack_delay transport parameter"

This reverts commit d19d65c.

Author: Dmitri Tikhonov

draft-ietf-quic-transport.md

@@ -1728,9 +1728,9 @@ disable_migration (0x0009):
 
 max_ack_delay (0x000c):
 
-: An 8-bit unsigned integer value to use as the maximum delay (in milliseconds)
-  when sending acknowledgements.  If this value is absent, a default of 25
-  milliseconds is assumed.
+: An 8 bit unsigned integer value indicating the maximum amount of time in
+  milliseconds by which it will delay sending of acknowledgments.  If this
+  value is absent, a default of 25 milliseconds is assumed.
 
 Either peer MAY advertise an initial value for the flow control on each type of
 stream on which they might receive data.  Each of the following transport