MILWAUKEE — The Kansas City Royals are a young team prone to mistakes. Those gaffes are magnified against the top teams in the league. On Sunday, the Royals were taught a valuable lesson after being swept by the Milwaukee Brewers. The Brewers outclassed the Royals in the third inning. The Royals made inexplicable errors. The Brewers scored seven runs en route to a 9-6 victory on Mother’s Day. …