CLEVELAND — Injured slugger Munetaka Murakami is expected to begin a rehab assignment with Triple-A Charlotte on Tuesday, and he could rejoin the White Sox on their homestand this week, manager Will Venable said Sunday. Murakami, who’s tied for second on the team with 20 home runs despite missing five weeks with a strained right hamstring, ran the bases Saturday and was supposed to run them again Sunday. With the field covered because of rain, that’s unlikely to happen. But after he recovered we