Review comments and documentation

include/trade_scene.h

@@ -9,7 +9,7 @@ u16 GetInGameTradeSpeciesInfo(void);
 u16 GetTradeSpecies(void);
 void sub_805049C(void);
 void sub_80504B0(void);
-void sub_80544FC(void);
+void LoadTradeAnimGfx(void);
 
 extern const u16 gUnknown_826601C[];
 extern const struct WindowTemplate gUnknown_826D1CC;