chore: [torrust#1543] remove comment on tracker-core handle_announcement

We need to load the number of downloads for the torrent before adding
it to the active swarms becuase the scrape response includes the number
of downloads, and that number should included all downloads ever.

Author: josecelano

packages/tracker-core/src/announce_handler.rs

@@ -163,11 +163,6 @@ impl AnnounceHandler {
     ) -> Result<AnnounceData, AnnounceError> {
         self.whitelist_authorization.authorize(info_hash).await?;
 
-        // This will be removed in the future.
-        // See https://github.com/torrust/torrust-tracker/issues/1502
-        // There will be a persisted metric for counting the total number of
-        // downloads across all torrents. The in-memory metric will count only
-        // the number of downloads during the current tracker uptime.
         let opt_persistent_torrent = if self.config.tracker_policy.persistent_torrent_completed_stat {
             self.db_downloads_metric_repository.load_torrent_downloads(info_hash)?
         } else {