docs: add more doc strings

src/edn.rs

@@ -1,9 +1,23 @@
 //! Project file format.
+//!
+//! This module `impl`s the `from_edn`, `load_edn`, etc. methods
+//! of structs that are defined in other modules. See:
+//!
+//! * [App::from_edn]
+//! * [App::load_edn]
+//! * [App::load_edn_one]
+//! * [Scene::load_edn]
+//! * [Track::load_edn]
+//! * [Phrase::load_edn]
+//! * [Sampler::load_edn]
+//! * [Sample::load_edn]
+//! * [LV2Plugin::load_edn]
 
 use crate::{core::*, model::*, App};
 
 use clojure_reader::{edn::{read, Edn}, error::Error as EdnError};
 
+/// EDN parsing helper.
 macro_rules! edn {
     ($edn:ident { $($pat:pat => $expr:expr),* $(,)? }) => {
         match $edn { $($pat => $expr),* }