hints: The auto mode switching hint is for 3.4.0

This is a feature addition with a slight behavior change, not a bug fix, so move it to 3.4.0.

include/SDL3/SDL_hints.h

@@ -3421,7 +3421,7 @@ extern "C" {
  *
  * This hint can be set anytime.
  *
- * \since This hint is available since SDL 3.2.10.
+ * \since This hint is available since SDL 3.4.0.
  */
 #define SDL_HINT_VIDEO_MATCH_EXCLUSIVE_MODE_ON_MOVE "SDL_VIDEO_MATCH_EXCLUSIVE_MODE_ON_MOVE"