Add comment to describe purpose

Make it clear why all peers have the time offset applied to them.

Co-authored-by: teor <teor@riseup.net>

zebra-network/src/peer_set/candidate_set.rs

@@ -372,6 +372,7 @@ fn limit_last_seen_times(addrs: &mut Vec<MetaAddr>, last_seen_limit: DateTime32)
         .max()
         .expect("unexpected empty address list");
 
+    // If any time is in the future, adjust all times, to compensate for clock skew on honest peers
     if most_recent_reported_seen_timestamp > last_seen_limit.timestamp() {
         let offset = most_recent_reported_seen_timestamp - last_seen_limit.timestamp();