Update couple of comments

node/core/pvf/src/prepare/pool.rs

@@ -293,8 +293,8 @@ fn handle_mux(
 			Ok(())
 		},
 		PoolEvent::StartWork(worker, outcome) => {
-			// If we receive any outcome other than `Concluded`, we attempt to kill the worker
-			// process.
+			// If we receive an outcome that the worker is unreachable or that an error occurred on
+			// the worker, we attempt to kill the worker process.
 			match outcome {
 				Outcome::Concluded { worker: idle, result } =>
 					handle_concluded_no_rip(from_pool, spawned, worker, idle, result),

node/core/pvf/src/prepare/worker.rs

@@ -77,8 +77,8 @@ pub enum Outcome {
 /// Given the idle token of a worker and parameters of work, communicates with the worker and
 /// returns the outcome.
 ///
-/// NOTE: Returning the `TimedOut` or `DidNotMakeIt` errors will trigger the child process being
-/// killed.
+/// NOTE: Returning the `TimedOut`, `IoErr` or `Unreachable` outcomes will trigger the child process
+/// being killed.
 pub async fn start_work(
 	worker: IdleWorker,
 	code: Arc<Vec<u8>>,