SDL: Sync SDL3 wiki -> header (129eb)

From 129ebc77b99bdc568337db7b074d35aebec44708 Mon Sep 17 00:00:00 2001
From: SDL Wiki Bot <[EMAIL REDACTED]>
Date: Thu, 23 Jan 2025 23:20:22 +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 081ab4825525a..854f53d11bb72 100644
--- a/include/SDL3/SDL_gpu.h
+++ b/include/SDL3/SDL_gpu.h
@@ -3410,7 +3410,9 @@ extern SDL_DECLSPEC void SDLCALL SDL_EndGPUComputePass(
 /**
  * Maps a transfer buffer into application address space.
  *
- * You must unmap the transfer buffer before encoding upload commands.
+ * You must unmap the transfer buffer before encoding upload commands. The
+ * memory is owned by the graphics driver - do NOT call SDL_free() on the
+ * returned pointer.
  *
  * \param device a GPU context.
  * \param transfer_buffer a transfer buffer.