Updated documentation for functions that return temporary memory

include/SDL3/SDL_pen.h

@@ -224,7 +224,7 @@ extern SDL_DECLSPEC SDL_bool SDLCALL SDL_PenConnected(SDL_PenID instance_id);
 /**
  * Retrieves a human-readable description for a SDL_PenID.
  *
- * The returned string follows the SDL_GetStringRule, and will be automatically freed later.
+ * This returns temporary memory which will be automatically freed later, and can be claimed with SDL_ClaimTemporaryMemory().
  *
  * \param instance_id the pen to query.
  * \returns a string that contains the name of the pen, intended for human