Document files with a few remaining symbols

src/minigame_countdown.c

@@ -447,7 +447,7 @@ static bool32 RunMinigameCountdownDigitsAnim(u8 spriteId)
     switch (sprite->sState)
     {
     case 0:
-        sub_8007E18(sprite, 0x800, 0x1A);
+        SetSpriteMatrixAnchor(sprite, NO_ANCHOR, 26);
         sprite->sState++;
         // fallthrough
     case 1: