SDL: keyboard: Add reference to SDL_Keymod in the comments

SDL Commits
1 
From 2bc3ec44b1b41fdd41b97d17afa16754579c1502 Mon Sep 17 00:00:00 2001
From: evgenydrainov <[EMAIL REDACTED]>
Date: Mon, 23 Jun 2025 22:05:02 +0300
Subject: [PATCH] keyboard: Add reference to SDL_Keymod in the comments

---
 include/SDL_keyboard.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/SDL_keyboard.h b/include/SDL_keyboard.h
index 62ac9f2288ac3..eb46db528ae0f 100644
--- a/include/SDL_keyboard.h
+++ b/include/SDL_keyboard.h
@@ -49,7 +49,7 @@ typedef struct SDL_Keysym
 {
     SDL_Scancode scancode;      /**< SDL physical key code - see SDL_Scancode for details */
     SDL_Keycode sym;            /**< SDL virtual key code - see SDL_Keycode for details */
-    Uint16 mod;                 /**< current key modifiers */
+    Uint16 mod;                 /**< current key modifiers - see SDL_Keymod for details */
     Uint32 unused;
 } SDL_Keysym;