As a newspaper editor on CBS' Dave's World, ex-deejay Shadoe Stevens hardly gets to flex his vocal muscles. Nowadays, he saves his baritone for bedtime storytelling as a parent. He has two daughters, Amber Dawn, 8, and Chyna Rose, 3, and the children's book he's most thankful for is Lewis Carroll's classic Alice's Adventures in Wonderland. ''There's so much imagination and creativity in one story,'' Stevens says. ''It made me realize you can write a book that appeals to both children and adults.'' That's just what he's decided to do. Stevens has authored a kids' book, Doc and the Button-Sided Hooeys, which he's hoping to get published soon.