While some naysayers bemoan James Holzhauer’s 28-game (and counting) “Jeopardy!” winning streak as “boring,” Ken Jennings has another word for it: “Astounding.” And he should know — only Jennings’ record of 74 consecutive games won and $2,520,700 in prize money stands between Holzhauer and the top spot in the “Jeopardy!” record books for both win...