SDL: include: make SDL_RenderPresent thread safety notes less verbose.

SDL Commits
1 
From 79cca812cb9bce9cf3815f9ecba871f4ec58d32f Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Wed, 25 Jan 2023 13:15:34 -0500
Subject: [PATCH] include: make SDL_RenderPresent thread safety notes less
 verbose.

Reference Issue #7140.
---
 include/SDL3/SDL_render.h | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/include/SDL3/SDL_render.h b/include/SDL3/SDL_render.h
index a8626c75d903..ded0f973b697 100644
--- a/include/SDL3/SDL_render.h
+++ b/include/SDL3/SDL_render.h
@@ -1393,10 +1393,7 @@ extern DECLSPEC int SDLCALL SDL_RenderReadPixels(SDL_Renderer *renderer,
  *
  * \param renderer the rendering context
  *
- * \threadsafety You may only call this function on the main thread. If this
- *               happens to work on a background thread on any given platform
- *               or backend, it's purely by luck and you should not rely on it
- *               to work next time.
+ * \threadsafety You may only call this function on the main thread.
  *
  * \since This function is available since SDL 3.0.0.
  *