Default SDL_HINT_JOYSTICK_GAMEINPUT to "1" on GDK platforms

include/SDL3/SDL_hints.h

@@ -1244,9 +1244,11 @@ extern "C" {
  *
  * The variable can be set to the following values:
  *
- * - "0": GameInput is not used. (default)
+ * - "0": GameInput is not used.
  * - "1": GameInput is used.
  *
+ * The default is "1" on GDK platforms, and "0" otherwise.
+ *
  * This hint should be set before SDL is initialized.
  *
  * \since This hint is available since SDL 3.0.0.