Document FRLG-unique vars in main.c

src/battle_controllers.c

@@ -481,7 +481,7 @@ static void Task_HandleSendLinkBuffersData(u8 taskId)
     }
 }
 
-void sub_800DD28(void)
+void TryReceiveLinkBattleData(void)
 {
     u8 i;
     s32 j;