MANCHESTER, United Kingdom (AFP) — Pep Guardiola announced on Friday that he will leave Manchester City at the end of the season after a trophy-laden decade that transformed English football. Guardiola guided City to 20 trophies, including six Premier League titles, and won the Champions League for the first time in the club's history. Aston Villa's visit to the Etihad Stadium on Sunday will be his final match in charge, although...