Document renewable_hidden_items

include/renewable_hidden_items.h

@@ -2,5 +2,8 @@
 #define GUARD_RENEWABLE_HIDDEN_ITEMS_H
 
 bool32 sub_815D834(void);
+void IncrementRenewableHiddenItemStepCounter(void);
+void TryRegenerateRenewableHiddenItems(void);
+void SetAllRenewableItemFlags(void);
 
 #endif //GUARD_RENEWABLE_HIDDEN_ITEMS_H