message: add a clarifying comment to the gossiper
diff: @@ -491,6 +491,11 @@ impl<T: Item + 'static, REv: ReactorEventT<T>> Gossiper<T, REv> {
  );
  if self.table.force_finish(&item_id) {
  + // Currently the only consumer of the `FinishedGossiping` announcement is the
  + // `BlockProposer`, and it's not a problem to it if the deploy is unavailable in storage
  + // as it should fail to retrieve the deploy too and hence not propose it. If we need to
  + // differentiate between successful termination of gossiping and this forced termination
  + // in the future, we can emit a new announcement variant here.
  return effect_builder.announce_finished_gossiping(item_id).ignore();
  }
  