Alan Shipnuck has very good timing. His new book is a biography of Rory McIlroy, the golf champion. It was published last month, two days before the Masters tournament. McIlroy won the Masters last year. That was surely the "hook" of the book, its impetus. The Masters had long been missing from McIlroy's "résumé." He had won the other three "majors": the U.S. Open, the British Open, and the PGA Championship. But now he had won all four, completing the "career Grand Slam." Only a handful in