Alex Rodriguez took a couple more swings up to No. 503. Mike Mussina saved mementos from No. 100. The Cleveland Indians? They got their usual two and stopped right there. Rodriguez kept up his unrelenting surge against the Indians — six homers in five games — and New York cruised to an 11-2 victory Saturday night that gave Mussina his 100th win with the Yankees, who have gone a month without slowing…