By Matt Audilet The Boston Celtics are getting a massive boost as they look to claim a 3-0 series lead over the Brooklyn Nets on Saturday night. During a pre-game press conference, Celtics head coach Ime Udoka revealed that starting center Robert Williams will be available for tonight’s Game 3 in Brooklyn. Udoka said Williams will take the court for “shorter stints” with a cap on his total minutes around 20. The fourth-year center reportedly had “some good 20-25 minute” scrimmage sessions before being fully cleared this evening. Williams has been off the court since March 27 with a torn menisc…