SDL: Fixed documentation errors in testautomation_render.c

SDL Commits
1 
From 5fab64f8621499bed20dfc90251226c61f4b2760 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Tue, 3 Jan 2023 16:26:08 -0800
Subject: [PATCH] Fixed documentation errors in testautomation_render.c

---
 test/testautomation_render.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/test/testautomation_render.c b/test/testautomation_render.c
index fcab71785376..a04402f9eccc 100644
--- a/test/testautomation_render.c
+++ b/test/testautomation_render.c
@@ -1037,7 +1037,8 @@ hasTexAlpha(void)
 /**
  * @brief Compares screen pixels with image pixels. Helper function.
  *
- * @param s Image to compare against.
+ * @param referenceSurface Image to compare against.
+ * @param allowable_error allowed difference from the reference image
  *
  * \sa
  * http://wiki.libsdl.org/SDL_RenderReadPixels