SDL: Update README-migration.md

From e4fdf42097fc7f62a8ae6da90e028c71250e8cd7 Mon Sep 17 00:00:00 2001
From: Sylvain <[EMAIL REDACTED]>
Date: Mon, 16 Jan 2023 09:49:04 +0100
Subject: [PATCH] Update README-migration.md

---
 docs/README-migration.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/docs/README-migration.md b/docs/README-migration.md
index 9a10c14c24b8..b6ece31801c6 100644
--- a/docs/README-migration.md
+++ b/docs/README-migration.md
@@ -54,6 +54,8 @@ SDL_PauseAudioDevice() is only used to pause audio playback. Use SDL_PlayAudioDe
 
 SDL_FreeWAV has been removed and calls can be replaced with SDL_free.
 
+SDL_AudioCVT interface is removed, SDL_AudioStream can be used instead.
+
 The following functions have been renamed:
 * SDL_AudioStreamAvailable() => SDL_GetAudioStreamAvailable()
 * SDL_AudioStreamClear() => SDL_ClearAudioStream()
@@ -65,6 +67,8 @@ The following functions have been renamed:
 
 
 The following functions have been removed:
+* SDL_ConvertAudio()
+* SDL_BuildAudioCVT()
 * SDL_OpenAudio()
 * SDL_CloseAudio()
 * SDL_PauseAudio()