events: Note that SDL_PenProximityEvent::pen_state was added for 3.4.16.

include/SDL3/SDL_events.h

@@ -913,7 +913,7 @@ typedef struct SDL_PenProximityEvent
     Uint64 timestamp;   /**< In nanoseconds, populated using SDL_GetTicksNS() */
     SDL_WindowID windowID; /**< The window with pen focus, if any */
     SDL_PenID which;        /**< The pen instance id */
-    SDL_PenInputFlags pen_state;   /**< Complete pen input state at time of event */
+    SDL_PenInputFlags pen_state;   /**< Complete pen input state at time of event (added in 3.4.16). */
 } SDL_PenProximityEvent;
 
 /**