SAN DIEGO — X will — and will not — mark the spot when John Doe headlines the 2022 edition of Adams Avenue Unplugged on April 30. And, no, that’s not a Zen Buddhist koan along the lines of: “What is the sound of one hand clapping?” The veteran singer-songwriter will be performing without X, the pioneering Los Angeles punk-rock group he co-founded in 1977. He’ll also be without the two-man rhythm section that will accompany him on his pending tour to promote his arresting new solo album, “Fables in a Foreign Land.” But he will probably include at least a song or two from X’s repertoire here, al…
