DORAL, Fla. — Scottie Scheffler doesn’t have much familiarity with Trump National Doral. Then again, hardly does anyone else in the field this week for the Cadillac Championship.The PGA Tour is back in Doral for the first time in a decade, this time as a 72-player, $20 million signature event. Some in the field are playing Doral as pros for the first time, and the overwhelming majority of players in this week’s field didn’t play in the most recent tour event on the Blue Monster in 2016.Scheffler — the world’s No. 1 player — is among the first-timers. After a couple of practice rounds at Doral this week, he seems to know what awaits over the next 72 holes. Figuring it all out, well, that’s another story.“There’s not really many tricks to this golf course,” Scheffler said. “It’s just very, very difficult. It’s a flat piece of land. There’s just a lot of bunkers, a lot of water and the golf holes are long. So, with that combination, it’s going to be tough.”Indeed, it is a tough course and a field including 10 of the world’s top 15 players. Even more of the world’s best likely would have been at Doral if it wasn’t such a jam-packed time on the golf calendar, with either five signature events or majors within this current six-week span that started with the Masters and ends with the PGA Championship in mid-May.Among those not playing this week: back-to- …