message: Add missing doc comments
diff: @@ -166,7 +166,7 @@ impl fmt::Display for Exposing {
  }
  }
  -/// Literals
  +/// Literal values
  #[derive(Debug, Clone, PartialEq)]
  pub enum Literal {
  /// String literals
  @@ -200,6 +200,7 @@ pub enum Term {
  /// Type
  /// ```
  Universe(ByteSpan, Option<u32>),
  + /// Literal values
  Literal(ByteSpan, Literal),
  /// Holes
  ///
  