add extra Arg methods in doc so examples still work
//! #[derive(StructOpt)]
//! #[structopt(name = "make-cookie")]
//! struct MakeCookie {
-//! #[structopt(name = "supervisor", default_value = "Puck")]
+//! #[structopt(name = "supervisor", default_value = "Puck", required = false, long = "supervisor")]
//! supervising_faerie: String,
//! #[structopt(name = "tree")]
//! /// The faerie tree this cookie is being made in.
