SDL: Sync SDL3 wiki -> header (165bf)

From 165bfd3e8328307cbffc2ed7cc4f0e101cb82ba5 Mon Sep 17 00:00:00 2001
From: SDL Wiki Bot <[EMAIL REDACTED]>
Date: Thu, 1 Jan 2026 19:18:39 +0000
Subject: [PATCH] Sync SDL3 wiki -> header

[ci skip]
---
 include/SDL3/SDL_hints.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/SDL3/SDL_hints.h b/include/SDL3/SDL_hints.h
index edd461653fd79..1e047dde79066 100644
--- a/include/SDL3/SDL_hints.h
+++ b/include/SDL3/SDL_hints.h
@@ -4766,7 +4766,8 @@ extern SDL_DECLSPEC bool SDLCALL SDL_GetHintBoolean(const char *name, bool defau
  * A callback used to send notifications of hint value changes.
  *
  * This is called an initial time during SDL_AddHintCallback with the hint's
- * current value, and then again each time the hint's value changes.
+ * current value, and then again each time the hint's value changes. In the
+ * initial call, the current value is in both `oldValue` and `newValue`.
  *
  * \param userdata what was passed as `userdata` to SDL_AddHintCallback().
  * \param name what was passed as `name` to SDL_AddHintCallback().