By Alek Arend Kevin Durant is ramping up his on-court training as he works his way back from a knee injury. Nets head coach Steve Nash gave a Durant update on Saturday afternoon. Nash revealed that Durant has begun on-court training. “He’s on the court shooting, working through things, looking really good,” Nash said after Saturday’s shootaround, via ESPN.com. “There’s still a period of time he’s got to go through to get over the line, but really positive.” Nash added Durant has been going through on-court training for about a week now. The team plans to expand Durant’s rehab as he inches clos…