By Patrick Hill Young singer and guitarist Eli Crossley gets a few tips from his rock heroes Bon Jovi after playing at the South by Southwest festival in Texas. The 16-year-old Brit, who has a muscle-wasting condition, was at Austin’s annual tech, music and film gala to launch a motor-assisted suit that will help move his upper body. His band, Askew, last year became the youngest to play Glastonbury. Eli said of meeting his heroes, whose hits include Keep the Faith: “Jon came in and the first thing he said was, ‘You played Glastonbury, get the f*** outta here!’ They’re rock ’n’ roll gods, bein…