update SDL3 from 3.2.20 to 3.4.2

libs/SDL3/include/SDL3/SDL_keyboard.h

@@ -1,6 +1,6 @@
 /*
   Simple DirectMedia Layer
-  Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
+  Copyright (C) 1997-2026 Sam Lantinga <slouken@libsdl.org>
 
   This software is provided 'as-is', without any express or implied
   warranty.  In no event will the authors be held liable for any damages
@@ -174,8 +174,7 @@ extern SDL_DECLSPEC void SDLCALL SDL_ResetKeyboard(void);
 /**
  * Get the current key modifier state for the keyboard.
  *
- * \returns an OR'd combination of the modifier keys for the keyboard. See
- *          SDL_Keymod for details.
+ * \returns an OR'd combination of the modifier keys for the keyboard.
  *
  * \threadsafety It is safe to call this function from any thread.
  *