MIAMI — Two coaches have joined Brian Flores’ racial discrimination class action lawsuit against the NFL and multiple teams, which includes the Dolphins. An amended complaint to the former Dolphins head coach’s lawsuit, originally filed on the first day of February, lists former Arizona Cardinals coach Steve Wilks and former defensive coordinator Ray Horton as plaintiffs. The suit, which originally listed the NFL, Dolphins, New York Giants and Denver Broncos as defendants, now also includes the Cardinals, Tennessee Titans and Houston Texans. The amended complaint alleges Wilks, who was head co…