Sync SDL3 wiki -> header

[ci skip]

Author: SDLWikiBot

include/SDL3/SDL_pen.h

@@ -28,9 +28,18 @@
  * handling, e.g., for input and drawing tablets or suitably equipped mobile /
  * tablet devices.
  *
- * To get started with pens, simply handle SDL_EVENT_PEN_* events. When a pen
- * starts providing input, SDL will assign it a unique SDL_PenID, which will
- * remain for the life of the process, as long as the pen stays connected.
+ * To get started with pens, simply handle pen events:
+ *
+ * - SDL_EVENT_PEN_PROXIMITY_IN, SDL_EVENT_PEN_PROXIMITY_OUT
+ *   (SDL_PenProximityEvent)
+ * - SDL_EVENT_PEN_DOWN, SDL_EVENT_PEN_UP (SDL_PenTouchEvent)
+ * - SDL_EVENT_PEN_MOTION (SDL_PenMotionEvent)
+ * - SDL_EVENT_PEN_BUTTON_DOWN, SDL_EVENT_PEN_BUTTON_UP (SDL_PenButtonEvent)
+ * - SDL_EVENT_PEN_AXIS (SDL_PenAxisEvent)
+ *
+ * When a pen starts providing input, SDL will assign it a unique SDL_PenID,
+ * which will remain for the life of the process, as long as the pen stays
+ * connected.
  *
  * Pens may provide more than simple touch input; they might have other axes,
  * such as pressure, tilt, rotation, etc.