Arsenal were mightily relieved as a 95th-minute equaliser from Smilla Holmberg rescued them a point at home to a much-improved Manchester United side, but the draw will not be enough to eradicate concerns about how far behind the leaders Manchester City they are slipping already. A defiant Manchester United stunned the north Londoners as Eva Olid’s side claimed the first point of her tenure with a performance that defied all of the pre-match scripts, but it was very nearly a victory, had it not…