message: Correct the docstring for SuccessData::RETURN_VARIANT
diff: @@ -260,6 +260,8 @@ mod sealed {
  /// Output from a successful `command` syscall.
  pub trait SuccessData: sealed::Sealed {
  + /// The return variant for this success type, stored in `r0` after
  + /// performing a `command` syscall.
  const RETURN_VARIANT: ReturnVariant;
  /// Constructs the success data given the raw register values.
  @@ -274,8 +276,6 @@ impl SuccessData for () {
  }
  impl sealed::Sealed for u32 {}
  impl SuccessData for u32 {
  - /// The return variant for this success type, stored in `r0` after
  - /// performing a `command` syscall.
  const RETURN_VARIANT: ReturnVariant = return_variant::SUCCESS_U32;
  fn from_raw_values(r1: u32, _r2: u32, _r3: u32) -> Self {
  