Add missing doc comments

src/de.rs

@@ -1,3 +1,5 @@
+//! Helpers for annotating types to deserialize from ITF values.
+
 use serde::de::DeserializeOwned;
 
 use crate::Value;

src/de/error.rs

@@ -1,5 +1,6 @@
 use std::fmt;
 
+/// Error type for deserialization.
 #[derive(Debug)]
 pub enum Error {
  Custom(String),

src/de/helpers.rs

@@ -85,7 +85,6 @@ pub type Integer = serde_with::TryFromInto<BigInt>;
 ///
 /// use itf::de::{self, As};
 ///
-///
 /// #[derive(Debug, PartialEq, Deserialize)]
 /// struct FooOption {
 /// #[serde(with = "As::<de::Option::<_>>")]

src/error.rs

@@ -1,3 +1,5 @@
+//! Error type for the library.
+
 /// Error type for the library.
 #[derive(Debug)]
 pub enum Error {

src/runner.rs

@@ -1,3 +1,5 @@
+//! Infrastructure for running a trace against a concrete implementation.
+
 use crate::Trace;
 
 pub trait Runner {

src/state.rs

@@ -1,3 +1,5 @@
+//! Defines the states contained within an ITF trace.
+
 use std::collections::BTreeMap;
 
 use serde::de::DeserializeOwned;

src/trace.rs

@@ -1,3 +1,5 @@
+//! Defines an ITF trace.
+
 use std::collections::BTreeMap;
 
 use serde::de::DeserializeOwned;