A government watchdog says Boeing didn’t give regulators documents about changes it made in a key system blamed in two crashes of its 737 Max jet. The Transportation Department’s inspector general says government experts responsible for approving the plane didn’t know how powerful the flight-control system was. In both crashes, the system, called MCAS, pushed the nose of the plane down and pilots couldn’t regain control. The crashes killed 346 people and led regulators around the world to ground every Boeing 737 Max — nearly 400 of them. This week, Boeing and the FAA are testing changes Boeing has made in the plane.