The world’s top-ranked golfer Scottie Scheffer said he was “pretty rattled” when he was arrested and handcuffed Friday morning in Kentucky but said he did some “stretching” in his cell before being released in time to tee off for the second round of the PGA Championship. Scheffer, 27, a two-time Masters champion, was busted when he tried to drive around a police officer at the Valhalla Golf Club in Louisville, Ky., following a fatal crash. “I feel like my head is still spinning,” Scheffler told reporters during a videotaped news conference after he shot a 5-under-par 66 to finish in fourth pla…