Apply suggestions from code review

Co-authored-by: Jana Iyengar <jri.ietf@gmail.com>

draft-ietf-quic-recovery.md

@@ -1484,9 +1484,8 @@ ssthresh:
   acknowledged.
 
 bytes_acked:
-: Store how many bytes acked so far. During congestion avoidance,
-  congestion window will be incremented by max_datagram_size
-  when this value is same or bigger than the congestion window.
+: Records number of bytes acked and used during congestion
+  avoidance, for incrementing the congestion window.
 
 
 ## Initialization