SDL_image: Update README.txt

From 39d24fe53837cacaa90db5415bbfec7b679d2c8f Mon Sep 17 00:00:00 2001
From: quinn <[EMAIL REDACTED]>
Date: Sun, 9 Apr 2023 00:32:55 +1000
Subject: [PATCH] Update README.txt

---
 README.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/README.txt b/README.txt
index 26d354fd..f6ec78b9 100644
--- a/README.txt
+++ b/README.txt
@@ -25,7 +25,7 @@ To create a surface from an XPM image included in C source, use:
 
 An example program 'showimage' is included, with source in showimage.c
 
-Documentation is also available online at https://wiki.libsdl.org/SDL_image
+Documentation is also available online at https://wiki.libsdl.org/SDL2_image
 
 This library is under the zlib License, see the file "LICENSE.txt" for details.