fix crate-docs and some lints

crates/pacdef_macros/src/action.rs

@@ -4,7 +4,7 @@ use syn::DeriveInput;
 use syn::__private::TokenStream2;
 
 pub fn action(input: TokenStream) -> TokenStream {
-    let input = syn::parse::<DeriveInput>(input).unwrap();
+    let input = syn::parse::<DeriveInput>(input).expect("I don't know when this could fail");
 
     let name = &input.ident;
 

crates/pacdef_macros/src/lib.rs

@@ -1,3 +1,6 @@
+/*!
+Procedural macros for `pacdef`.
+*/
 #![warn(
     clippy::as_conversions,
     clippy::option_if_let_else,

crates/pacdef_macros/src/register.rs

@@ -4,7 +4,7 @@ use syn::DeriveInput;
 use syn::__private::TokenStream2;
 
 pub fn register(input: TokenStream) -> TokenStream {
-    let input = syn::parse::<DeriveInput>(input).unwrap();
+    let input = syn::parse::<DeriveInput>(input).expect("I don't know when this could fail");
 
     let name = &input.ident;