Add note about two distinct sets of vehicle params

en/sim_sih/index.md

@@ -177,6 +177,7 @@ The specific differences for SIH simulation airframes are listed in the sections
 For all variants of SIH:
 
   - Set all the [Simulation In Hardware](../advanced_config/parameter_reference.md#simulation-in-hardware) parameters (prefixed with `SIH_`) in order to configure the physical model of the vehicle.
+    - Keep in mind that some of these parameters are redundant -- make sure that the `SIH_*` parameters and the `CA_*` parameters describe the same vehicle. Not every vehicle can be simulated with SIH -- there are [four vehicle types](../advanced_config/parameter_reference.md#SIH_VEHICLE_TYPE), each of which has a relatively rigid implementation in [`sih.cpp`](https://github.com/PX4/PX4-Autopilot/blob/main/src/modules/simulation/simulator_sih/sih.cpp). 
   - `param set-default SYS_HITL 2` to enable SIH on the next boot.
   - `param set-default CBRK_SUPPLY_CHK 894281` to disable power valid check.
   - `param set-default CBRK_IO_SAFETY 22027` to disable IO safety check.