LAS VEGAS — From his earliest days in professional football, Travis Kelce wanted people to know him. In a sport that restricts personalities and shields faces, he aspired to get his “out from under the helmet,” he said. He pursued and planned for fame. But he did not foresee the vortex of the past five months, which transformed him from a superstar tight end and burgeoning celebrity to a figure of global fascination. He was asked this week what the whirlwind taught him. Kelce is an uncomplicated man, and he reached an uncomplicated conclusion.