SDL: Sync SDL3 wiki -> header (f860d)

From f860d9d592fde0668ffdc3e7e0f09542e772b862 Mon Sep 17 00:00:00 2001
From: SDL Wiki Bot <[EMAIL REDACTED]>
Date: Tue, 16 Jun 2026 02:19:11 +0000
Subject: [PATCH] Sync SDL3 wiki -> header

[ci skip]
---
 include/SDL3/SDL_gpu.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/SDL3/SDL_gpu.h b/include/SDL3/SDL_gpu.h
index 065c00bc652a7..c4fc914638f8d 100644
--- a/include/SDL3/SDL_gpu.h
+++ b/include/SDL3/SDL_gpu.h
@@ -2459,7 +2459,9 @@ extern SDL_DECLSPEC int SDLCALL SDL_GetNumGPUDrivers(void);
  * meant to be proper names.
  *
  * \param index the index of a GPU driver.
- * \returns the name of the GPU driver with the given **index**.
+ * \returns the name of the GPU driver with the given **index** or NULL when
+ *          the index is out of bounds; call SDL_GetError() for more
+ *          information.
  *
  * \since This function is available since SDL 3.2.0.
  *