SAN FRANCISCO — With three mighty swings, Pablo Sandoval put the San Francisco Giants ahead in this World Series and put himself in a class with Mr. October. Sandoval hit three home runs and joined Reggie Jackson, Babe Ruth and Albert Pujols as the only sluggers to do it in the Series, and the Giants jolted Justin Verlander the Detroit Tigers 8-3 on Wednesday night in Game 1. A rollicking AT&T Park crowd — a sea of black and orange outfits — roared as Sandoval connected in his first three at-bats.