LONDON — It is never easy to put history into context just as it’s being made, so it may be many more years before the real magnitude of Manchester City’s domestic Treble can be properly judged. But by inflicting a 6-0 defeat on Watford in the FA Cup final on Saturday, Pep Guardiola’s City achieved what no men’s club has done before by winning the Premier League, FA Cup and Carabao Cup in the same season. However you feel about it, their place in history is certainly assured. Saturday’s Cup final win against Javi Gracia’s team was City’s 50th victory of the campaign, in their 61st game, and they took their goals tally to 169 and equalling Bury’s 116-year record for the biggest-ever FA Cup final winning margin in the process. It’s clear that the record books are in need of some rewriting. – Ratings: Sterling a perfect 10/10 at WembleyMan City smash Watford to win FA Cup English football has produced some iconic sides over the years — the Double winners at Arsenal, Tottenham and Liverpool, or the Treble winners (Champions League, Premier League and FA Cup) at Manchester United — but City’s class of 2019 are now in…