add missing docs

crates/pacdef_macros/src/lib.rs

@@ -1,13 +1,29 @@
+#![warn(
+    clippy::as_conversions,
+    clippy::option_if_let_else,
+    clippy::redundant_pub_crate,
+    clippy::unused_self,
+    clippy::unwrap_used,
+    clippy::use_debug,
+    clippy::use_self,
+    clippy::wildcard_dependencies,
+    missing_docs
+)]
+
 mod action;
 mod register;
 
 use proc_macro::TokenStream;
 
+/// Derive (1) an iterator over the variants, (2) imports for the individual backends, and (3)
+/// instatiation code for each backend.
 #[proc_macro_derive(Register)]
 pub fn register(input: TokenStream) -> TokenStream {
     register::register(input)
 }
 
+/// Derive public constants from each variant of the enum, such that the name of the constant is
+/// the name of the variant in all caps, and the value is the name of the variant in lowercase.
 #[proc_macro_derive(Action)]
 pub fn action(input: TokenStream) -> TokenStream {
     action::action(input)