With their penchant for cathartic lyrics and intense alt-rock instrumentals, 3 Doors Down has given their fans an open-door therapy session for nearly 30 years. Now, to celebrate their sophomore album “Away from the Sun,” the group is on the road performing songs from that album as well as some of their other hits, their biggest being “Kryptonite,” a single from their debut LP “The Better Life” released in February 2000…