message: Fix rustdoc warnings when documenting private items
diff: @@ -48,13 +48,13 @@ pub enum RegistryConfig {
  impl RegistryConfig {
  /// Returns `true` if the credential is [`None`].
  ///
  - /// [`None`]: Credential::None
  + /// [`None`]: Self::None
  pub fn is_none(&self) -> bool {
  matches!(self, Self::None)
  }
  /// Returns `true` if the credential is [`Token`].
  ///
  - /// [`Token`]: Credential::Token
  + /// [`Token`]: Self::Token
  pub fn is_token(&self) -> bool {
  matches!(self, Self::Token(..))
  }
  