Clarify that the SDL_GetStringRule means that SDL will automatically free the memory later.

include/SDL3/SDL_haptic.h

@@ -949,7 +949,7 @@ extern SDL_DECLSPEC SDL_HapticID *SDLCALL SDL_GetHaptics(int *count);
  *
  * This can be called before any haptic devices are opened.
  *
- * The returned string follows the SDL_GetStringRule.
+ * The returned string follows the SDL_GetStringRule, and will be automatically freed later.
  *
  * \param instance_id the haptic device instance ID.
  * \returns the name of the selected haptic device. If no name can be found,
@@ -1014,7 +1014,7 @@ extern SDL_DECLSPEC SDL_HapticID SDLCALL SDL_GetHapticID(SDL_Haptic *haptic);
 /**
  * Get the implementation dependent name of a haptic device.
  *
- * The returned string follows the SDL_GetStringRule.
+ * The returned string follows the SDL_GetStringRule, and will be automatically freed later.
  *
  * \param haptic the SDL_Haptic obtained from SDL_OpenJoystick().
  * \returns the name of the selected haptic device. If no name can be found,