It took Kevin Nealon over 30 years to find out why he lost his job at the “Weekend Update” desk on “Saturday Night Live.” “I’m just finishing reading that book called ‘Lorne.’ It’s about Lorne Michaels. And I’m learning what happened behind the scenes that I didn’t know about,” the comedian, 72, told “Obsessed: The Podcast” host Matt Wilstein over the weekend. In 1994, at which point Nealon had been on “Weekend Update” for three years, Entertainment Weekly published an article titled “Is ‘