message: Fix typos in command_prelude.rs
diff: @@ -59,7 +59,7 @@ pub trait AppExt: Sized {
  fn arg_package(self, package: &'static str) -> Self {
  self._arg(
  - optinal_opt("package", package)
  + optional_opt("package", package)
  .short("p")
  .value_name("SPEC"),
  )
  @@ -225,7 +225,7 @@ pub trait AppExt: Sized {
  fn arg_future_incompat_report(self) -> Self {
  self._arg(opt(
  "future-incompat-report",
  - "Ouputs a future incompatibility report at the end of the build (unstable)",
  + "Outputs a future incompatibility report at the end of the build (unstable)",
  ))
  }
  }
  @@ -240,7 +240,7 @@ pub fn opt(name: &'static str, help: &'static str) -> Arg<'static, 'static> {
  Arg::with_name(name).long(name).help(help)
  }
  -pub fn optinal_opt(name: &'static str, help: &'static str) -> Arg<'static, 'static> {
  +pub fn optional_opt(name: &'static str, help: &'static str) -> Arg<'static, 'static> {
  opt(name, help).min_values(0)
  }
  