Forty thousand people stood in the rain. A few dozen players and coaches danced around a puddled infield. They were soaked, all of them, and in no hurry to take cover. Not after what the San Francisco Giants did to reach the World Series. Down three games to one in the National League Championship Series, the Giants won the last three games by a combined score of 20-1, an overpowering comeback that culminated with Monday’s 9-0 rout of the St. Louis Cardinals in Game 7. They’ll host the Detroit Tigers when the World Series begins Wednesday night.