message: Add more explanatory comment to `SyncFinished` announcement
diff: @@ -75,7 +75,10 @@ pub(crate) enum JoiningOutcome {
  /// A chain synchronizer announcement.
  #[derive(Debug)]
  pub(crate) enum ChainSynchronizerAnnouncement {
  - /// Synchronization has been finished.
  + /// The node has finished the synchronization it was doing (fast-sync or sync-to-genesis,
  + /// depending on config) and may now accept requests that are unsafe for nodes that are
  + /// synchronizing. Once this message is received, the only way for the peer to signal it's in
  + /// the syncing process is to reconnect.
  SyncFinished,
  }
  