Garth Brooks is coming to Yankee Stadium July 9, for a show that will be captured on film for an even bigger audience. Because Garth already proved just how at home he can make himself in the Big Apple back in 1997, when his free Central Park concert seemed to make all of Manhattan into that proverbial low place he came to fame singing about. By that standard, July’s Yankee Stadium gig will be a comparative club gig.