By Jelani Scott The standout defender played through Boston’s run to the NBA finals with knee issues. View the original article to see embedded media. Celtics center Robert Williams III is expected to miss the start of the 2022–23 season after undergoing an arthroscopic procedure on his left knee. The organization announced Friday the standout defender is on the mend following surgery to “remove loose bodies and address swelling” in the knee. Williams, who also underwent surgery on March 30 to repair a torn left meniscus, is projected to return to basketball activities in eight to 12 weeks, pe…