P.R. Venkat / Wall Street Journal:Lenovo reports Q2 revenue up 15% YoY to $20.45B, vs. $20B est., net profit down 5% to $340M, vs. $382M est., but adjusted net profit up 25% to $512M — Revenue for the three months ended Sept. 30 increased 15% — Lenovo Group's revenue rose sharply in the second quarter …