Boeing’s Starliner capsule, carrying a pair of NASA astronauts, docked with the International Space Station Thursday, completing the first leg of an important test flight after several of its thrusters went offline, forcing a dramatic, last-minute scramble to troubleshoot the issue. Traveling some 240 miles above Earth, the autonomous spacecraft slowly nestled in to one of the orbiting laboratory’s docking ports as the two vehicles whizzed around Earth at some 17,500 m.p.h. The docking came...