Update index.md

Document SIH Standard VTOL Airframe, added in PX4/PX4-Autopilot#24175

en/sim_sih/index.md

@@ -26,6 +26,7 @@ The Desktop computer is only used to display the virtual vehicle.
 - SIH for quadrotor is supported from PX4 v1.9.
 - SIH for fixed-wing (airplane) and VTOL tailsitter are supported from PX4 v1.13.
 - SIH as SITL (without hardware) from PX4 v1.14.
+- SIH for Standard VTOL from PX4 v1.16. 
 
 ### Benefits
 
@@ -59,7 +60,8 @@ To set up/start SIH:
    - [SIH Quadcopter X](../airframes/airframe_reference.md#copter_simulation_sih_quadcopter_x)
    - [SIH plane AERT](../airframes/airframe_reference.md#plane_simulation_sih_plane_aert)
    - [SIH Tailsitter Duo](../airframes/airframe_reference.md#vtol_simulation_sih_tailsitter_duo)
-
+   - [SIH Standard VTOL QuadPlane](../airframes/airframe_reference.md#vtol_simulation_sih_standard_vtol_quadplane)
+
 The autopilot will then reboot.
 The `sih` module is started on reboot, and the vehicle should be displayed on the ground control station map.