message: Add a comment about the maximum round exponent.
diff: @@ -111,6 +111,9 @@ impl<C: Context + 'static> HighwayProtocol<C> {
  .core_config
  .minimum_block_time
  .max(TimeDiff::from(1));
  + // The maximum round exponent x is such that 2^x * m is at most M, where m and M are min
  + // and max round length. So x is the floor of log_2(M / m). Thus the ceiling of
  + // log_2(M / m + 1) is always x + 1.
  let maximum_round_exponent = (highway_config.maximum_round_length / minimum_round_length)
  .saturating_add(1)
  .next_power_of_two()
  