Doc provides us with the update: “[Garnett] was on the treadmill [Tuesday], and I thought he was walking for the first time without a different gait,” Rivers said before the Celtics took a 115-111 win over the Nets last night. “And I don’t know what that means, but it’s got to be better than the other day, when he was limping. I told him, ‘You’ve been here for eight hours, and what are you doing here all day?’”