By Nikhil Sharma (Reuters) -Canada’s main stock index fell on Wednesday, with mining shares leading the declines, as investors rushed to book profits ahead of the U.S. presidential election and Federal Reserve’s rate-setting meeting next week. The S&P/TSX composite index was down 36.6 points, or 0.15%, at 24,525.95. Materials shares led overall sectoral losses with a fall of 1.1%, while the


