WASHINGTON — Avoiding overtime in Game 6 when Paul Pierce’s potential tying 3-pointer was released after the clock expired, the Atlanta Hawks made it to the Eastern Conference finals for the first time by beating the Washington Wizards 94-91 on Friday night. The Hawks held on thanks primarily to DeMarre Carroll’s playoff career-high 25 points, including two layups in the last minute off assists from Jeff Teague. After Al Horford went 1 of 2 from the free-throw line for a three-point lead, the Wizards inbounded the ball with 6.4 seconds left.