DENVER, Colo. — One of the NFL’s rising-star coaching candidates is getting a promotion in Denver. Davis Webb, who has been on the Broncos’ staff as quarterbacks coach and passing game coordinator for the past three years, will now be the team’s offensive coordinator. He is widely regarded as one of the league’s top young coaching talents. He interviewed for three head coach vacancies in recent weeks: the Baltimore Ravens, Buffalo Bills and Las Vegas Raiders.