Hello,
I assume you meant Arrow, too, so I edited your title and body.
I don’t own the Arrow, but I own three other Carenado aircraft. On my MS Store version, the documentation is located here:
Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalCache\Packages\Official\OneStore\carenado-aircraft-ct182t-skylane-g1000\SimObjects\Airplanes\Carenado_CT182T_Skylane_G1000\Documentation
Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalCache\Packages\Official\OneStore\carenado-aircraft-m20r-ovation\SimObjects\Airplanes\Carenado_M20R_Ovation\Documentation
I also own their PA44 Seminole, and the corresponding Documentation folder exists for that aircraft, but there’s nothing inside the folder.