Style and Clippy fixes.

src/ffi/static_data/libraries/mod.rs

@@ -1,7 +1,12 @@
+/// The foreign function interface for the growth rate library.
 mod growth_rate_library;
+/// The foreign function interface for the library settings.
 mod library_settings;
+/// The foreign function interface for the nature library.
 mod nature_library;
+/// The foreign function interface for the static data.
 mod static_data;
+/// The foreign function interface for the type library.
 mod type_library;
 
 use crate::ffi::{BorrowedPtr, IdentifiablePointer, OwnedPtr};
@@ -10,6 +15,7 @@ use std::ffi::{c_char, CStr};
 use std::ptr::drop_in_place;
 use std::sync::Arc;
 
+/// Generates foreign function interfaces for a DataLibrary trait implementation.
 macro_rules! library_interface {
     ($library_type:ty, $return_type:ty) => {
         paste::paste! {