SDL: docs: Documentation for SDL_Swap64 was reporting the wrong return type.

SDL Commits
1 
From 530639aa4a72f6480b2c8caac7ca75cd005fe8bc Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Wed, 2 Jul 2025 09:28:53 -0400
Subject: [PATCH] docs: Documentation for SDL_Swap64 was reporting the wrong
 return type.

Fixes #13309.
---
 include/SDL3/SDL_endian.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/SDL3/SDL_endian.h b/include/SDL3/SDL_endian.h
index a34e9d4b09c1f..2a9b8a34d889d 100644
--- a/include/SDL3/SDL_endian.h
+++ b/include/SDL3/SDL_endian.h
@@ -486,7 +486,7 @@ SDL_FORCE_INLINE Uint32 SDL_Swap32(Uint32 x) { return x_but_byteswapped; }
  *
  * \since This function is available since SDL 3.2.0.
  */
-SDL_FORCE_INLINE Uint32 SDL_Swap64(Uint64 x) { return x_but_byteswapped; }
+SDL_FORCE_INLINE Uint64 SDL_Swap64(Uint64 x) { return x_but_byteswapped; }
 
 /**
  * Swap a 16-bit value from littleendian to native byte order.