docs: a few more validation task docs (#6351)

crates/node-core/src/node_config.rs

@@ -462,6 +462,7 @@ impl NodeConfig {
         let validator = TransactionValidationTaskExecutor::eth_builder(Arc::clone(&self.chain))
             .with_head_timestamp(head.timestamp)
             .kzg_settings(self.kzg_settings()?)
+            // use an additional validation task so we can validate transactions in parallel
             .with_additional_tasks(1)
             .build_with_tasks(blockchain_db.clone(), executor.clone(), blob_store.clone());
 

crates/transaction-pool/src/validate/task.rs

@@ -18,6 +18,10 @@ use tokio::{
 use tokio_stream::wrappers::ReceiverStream;
 
 /// A service that performs validation jobs.
+///
+/// This listens for incoming validation jobs and executes them.
+///
+/// This should be spawned as a task: [ValidationTask::run]
 #[derive(Clone)]
 pub struct ValidationTask {
     #[allow(clippy::type_complexity)]