Apply suggestion from @Copilot

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: Tuntii

docs/cookbook/src/crates/rustapi_jobs.md

@@ -69,7 +69,9 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     // 4. Start the worker in the background
     let worker_queue = queue.clone();
     tokio::spawn(async move {
-        worker_queue.start_worker().await;
+        if let Err(e) = worker_queue.start_worker().await {
+            eprintln!("Worker failed: {:?}", e);
+        }
     });
 
     // 5. Enqueue a job (pass the DATA, not the handler)