Document Trainer Tower scripts

include/renewable_hidden_items.h

@@ -1,7 +1,7 @@
 #ifndef GUARD_RENEWABLE_HIDDEN_ITEMS_H
 #define GUARD_RENEWABLE_HIDDEN_ITEMS_H
 
-bool32 sub_815D834(void);
+bool32 ReadTrainerHillAndValidate(void);
 void IncrementRenewableHiddenItemStepCounter(void);
 void TryRegenerateRenewableHiddenItems(void);
 void SetAllRenewableItemFlags(void);