SALT LAKE CITY — NHL commissioner Gary Bettman believes that the Vegas Golden Knights are still the standard bearer when it comes to the sports boom in Las Vegas. Bettman said it was satisfying that the Knights have found as much success as they approach their 10th season in the league, and as more professional teams call Southern Nevada home. “It’s been very gratifying to see a market that some were critical or skeptical about when we announced expansion,” Bettman said prior to Game 3 between the Knights and Utah Mammoth at Delta Center on Friday. “Now, we see that every other sport thinks they invented it, it has been a little gratifying.” The Knights are in the playoffs for an eighth time in nine seasons, have two trips to the Stanley Cup Finals and one championship to show for it. “(Knights owner) Bill (Foley) and his people have done everything that you would want to do in Las Vegas for the creation of the first major league team there,” Bettman said.…