Remove outdated comment about SDL_SoftStretch
diff --git a/include/SDL_surface.h b/include/SDL_surface.h
index 2051aba..b6acd47 100644
--- a/include/SDL_surface.h
+++ b/include/SDL_surface.h
@@ -806,8 +806,6 @@ extern DECLSPEC int SDLCALL SDL_LowerBlit
* Perform a fast, low quality, stretch blit between two surfaces of the
* same format.
*
- * **Warning**: This function uses a static buffer, and is not thread-safe.
- *
* Please use SDL_BlitScaled() instead.
*/
extern DECLSPEC int SDLCALL SDL_SoftStretch(SDL_Surface * src,