message: Fix bad comment
diff: @@ -369,8 +369,8 @@ class SelfPlayer {
  }
  {
  - // Log the end game info with the mutex held multiple lines being
  - // interleaved.
  + // Log the end game info with the shared mutex held to prevent the
  + // outputs from multiple threads being interleaved.
  absl::MutexLock lock(&mutex_);
  LogEndGameInfo(player.get(), absl::Now() - start_time);
  }
  