Submitted for your approval: a thoughtful treatise on kindness, generosity and humility, co-existing with an incisive look at how a writer’s moral code can give his work a consistent sense of right and wrong without preaching to his audience. The writer in question is Rod Serling, creator of “The Twilight Zone,” and in television critic Mark Dawidziak’s new book “Everything I Need to Know I Learned in the Twilight Zone,” readers are given a comprehensive tour of Mr.