fix typo

instance.go

@@ -69,7 +69,7 @@ func setupInstance(member *discordgo.Member) *chatInstance {
 
 	parentID := categoryMap[channelID]
 	if parentID == "" {
-		log.Debug("Instance setup skipped on emptu parent ID.")
+		log.Debug("Instance setup skipped on empty parent ID.")
 		return nil
 	}