By Kevin Burns, Beer Columnist The leaves are changing and the weather is getting cooler. While these signs mark the arrival of fall to many people, I know it is Fall when Oktoberfest and Pumpkin Ales start to show up on the shelves of beer stores.   This week's beer review is fo Saranac Octoberfest Lager from the F.X. Matt Brewing Company.   Saranac's Octoberfest poured a dark copper color with a two-finger width of white head. The nose is pleasant, and well balanced with malt up front and distinct hop aromas underneath. There is a faint trace of spices as well.  The body has a…