SDL: include: Fix indentation on SDL_SoftStretch doxygen comment.

SDL Commits
1 
From 194657a2c6172b41d7cb84cc6eddc7e0a04f70a2 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Fri, 8 Oct 2021 15:57:18 -0400
Subject: [PATCH] include: Fix indentation on SDL_SoftStretch doxygen comment.

Otherwise wikiheaders.pl doesn't think it's valid.
---
 include/SDL_surface.h | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/include/SDL_surface.h b/include/SDL_surface.h
index 1986576014..cf988a453c 100644
--- a/include/SDL_surface.h
+++ b/include/SDL_surface.h
@@ -811,12 +811,12 @@ extern DECLSPEC int SDLCALL SDL_LowerBlit
      SDL_Surface * dst, SDL_Rect * dstrect);
 
 
- /**
-  * Perform a fast, low quality, stretch blit between two surfaces of the
-  * same format.
-  *
-  * Please use SDL_BlitScaled() instead.
-  */
+/**
+ * Perform a fast, low quality, stretch blit between two surfaces of the
+ * same format.
+ *
+ * Please use SDL_BlitScaled() instead.
+ */
 extern DECLSPEC int SDLCALL SDL_SoftStretch(SDL_Surface * src,
                                             const SDL_Rect * srcrect,
                                             SDL_Surface * dst,