SDL: docs: migration guide note that SDL_LoadWAV has a different return type.

SDL Commits
1 
From eee407caf89949287f4db355df60c2a1f7869c7e Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Sat, 24 Jun 2023 00:36:19 -0400
Subject: [PATCH] docs: migration guide note that SDL_LoadWAV has a different
 return type.

---
 docs/README-migration.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/docs/README-migration.md b/docs/README-migration.md
index 1ce3bb34f165..81b5bcb21a1e 100644
--- a/docs/README-migration.md
+++ b/docs/README-migration.md
@@ -172,6 +172,8 @@ SDL_FreeWAV has been removed and calls can be replaced with SDL_free.
 
 SDL_LoadWAV() is a proper function now and no longer a macro (but offers the same functionality otherwise).
 
+SDL_LoadWAV_RW() and SDL_LoadWAV() return an int now: zero on success, -1 on error, like most of SDL. They no longer return a pointer to an SDL_AudioSpec.
+
 SDL_AudioCVT interface has been removed, the SDL_AudioStream interface (for audio supplied in pieces) or the new SDL_ConvertAudioSamples() function (for converting a complete audio buffer in one call) can be used instead.
 
 Code that used to look like this: