state: add rustdoc links

zebra-state/src/lib.rs

@@ -27,5 +27,5 @@ pub use request::Request;
 pub use response::Response;
 pub use service::init;
 
-/// A boxed `std::error::Error`.
+/// A boxed [`std::error::Error`].
 pub type BoxError = Box<dyn std::error::Error + Send + Sync + 'static>;

zebra-state/src/service.rs

@@ -44,7 +44,7 @@ impl Service<Request> for StateService {
     }
 }
 
-/// Initialize a state service from the provided `config`.
+/// Initialize a state service from the provided [`Config`].
 ///
 /// Each `network` has its own separate sled database.
 ///