document battle transition symbols

src/teachy_tv.c

@@ -1208,11 +1208,11 @@ static void TeachyTvPreBattleAnimAndSetBattleCallback(u8 taskId)
     switch (data[7])
     {
     case 0:
-        sub_80D08B8(data[6]);
+        BT_StartOnField(data[6]);
         ++data[7];
         break;
     case 1:
-        if (sub_80D08F8())
+        if (BT_IsDone())
         {
             SetMainCallback2(sub_800FD9C);
             DestroyTask(taskId);

src/trainer_tower.c

@@ -1111,7 +1111,7 @@ void sub_815E114(void)
 
 void sub_815E124(u8 taskId)
 {
-    if (sub_80D08F8() == TRUE)
+    if (BT_IsDone() == TRUE)
     {
         gMain.savedCallback = sub_815E114;
         CleanupOverworldWindowsAndTilemaps();
@@ -1129,7 +1129,7 @@ void sub_815E160(void)
     sub_815E9FC();
     CreateTask(sub_815E124, 1);
     PlayMapChosenOrBattleBGM(0);
-    sub_80D08B8(sub_8080060());
+    BT_StartOnField(sub_8080060());
 }
 
 void sub_815E1C0(void)