SDL: docs: Note that audio opening doesn't implicitly init SDL now.

From e50cb72eb64698bb572a08d4e8c329f351912a94 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Thu, 22 Jun 2023 18:29:45 -0400
Subject: [PATCH] docs: Note that audio opening doesn't implicitly init SDL
 now.

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

diff --git a/docs/README-migration.md b/docs/README-migration.md
index 10366ced2092..cc7c75a59001 100644
--- a/docs/README-migration.md
+++ b/docs/README-migration.md
@@ -57,6 +57,8 @@ The audio subsystem in SDL3 is dramatically different than SDL2. The primary way
 
 The SDL 1.2 audio compatibility API has also been removed, as it was a simplified version of the audio callback interface.
 
+SDL3 will not implicitly initialize the audio subsystem on your behalf if you open a device without doing so. Please explicitly call SDL_Init(SDL_INIT_AUDIO) at some point.
+
 If your app depends on the callback method, there is a similar approach you can take. But first, this is the new approach:
 
 In SDL2, you might have done something like this to play audio: