Shania Twain grew up dirt poor in rural Ontario, and as a child sang country songs in bars. Throughout family hardships, divorce, and losing her voice to Lyme disease, and despite not signing a record contract until her late 20s, Twain became the top-selling female country artist of all time. She talks with correspondent Seth Doane about her biographical new album, “Little Miss Twain,” in which she reflects on her life with a smile.