By Matthew Cooper Manchester United legends including David Beckham, Gary Neville and Andy Cole have reunited for the premier of a new Amazon Prime documentary titled ’99’. The series documents United’s historic treble-winning season, where Sir Alex Ferguson’s side won the Premier League, the FA Cup and the Champions League in the space of just 10 days in 1999. The likes of Beckham, Neville, Paul Scholes, Peter Schmeichel and Ole Gunnar Solskjaer were all interviewed for the documentary and Amazon have said it also contains “never-before-seen archive footage” and “behind-the-scenes candid vide…