Document old man batttle controller

src/trainer_card.c

@@ -618,7 +618,7 @@ static void Task_TrainerCard(u8 taskId)
         }
         break;
     case STATE_WAIT_LINK_PARTNER:
-        Link_TryStartSend5FFF();
+        SetCloseLinkCallback();
         DrawDialogueFrame(0, 1);
         AddTextPrinterParameterized(0, 2, gText_WaitingTrainerFinishReading, 0, 1, TEXT_SPEED_FF, 0);
         CopyWindowToVram(0, COPYWIN_BOTH);