SDL: Added a reference to SDL_HINT_KEYCODE_OPTIONS from SDL_Keycode documentation

From 6e63f255b9ffa9bac65d4b87f9ac99b754b431a6 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Sun, 12 Oct 2025 21:51:14 -0700
Subject: [PATCH] Added a reference to SDL_HINT_KEYCODE_OPTIONS from
 SDL_Keycode documentation

---
 include/SDL3/SDL_keycode.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/SDL3/SDL_keycode.h b/include/SDL3/SDL_keycode.h
index 61b68e794f8e0..a8b1378ec933b 100644
--- a/include/SDL3/SDL_keycode.h
+++ b/include/SDL3/SDL_keycode.h
@@ -51,6 +51,8 @@
  * unicode code point.
  *
  * \since This datatype is available since SDL 3.2.0.
+ *
+ * \sa SDL_HINT_KEYCODE_OPTIONS
  */
 typedef Uint32 SDL_Keycode;