Document some warp/field screen effect

src/player_pc.c

@@ -508,7 +508,7 @@ void Mailbox_DoRedrawMailboxMenuAfterReturn(void)
     sub_81973A4();
     DrawDialogueFrame(0, 1);
     InitItemStorageMenu(CreateTask(ItemStorage_HandleReturnToProcessInput, 0), 1);
-    pal_fill_black();
+    FadeInFromBlack();
 }
 
 static void ItemStorage_HandleReturnToProcessInput(u8 taskId)
@@ -745,7 +745,7 @@ static void pal_fill_for_maplights_or_black(void)
         Mailbox_DrawMailboxMenu(taskId);
     else
         DestroyTask(taskId);
-    pal_fill_black();
+    FadeInFromBlack();
 }
 
 static void Mailbox_HandleReturnToProcessInput(u8 taskId)
@@ -852,7 +852,7 @@ static void Mailbox_UpdateMailListAfterDeposit(void)
         Mailbox_DrawMailboxMenu(taskId);
     else
         DestroyTask(taskId);
-    pal_fill_black();
+    FadeInFromBlack();
 }
 
 static void Mailbox_NoPokemonForMail(u8 taskId)