Update doc/api/worker_threads.md

Co-authored-by: Antoine du Hamel <[email protected]>

Author: deokjinkim

doc/api/worker_threads.md

@@ -1991,7 +1991,7 @@ worker.on('online', async () => {
 const { Worker } = require('node:worker_threads');
 
 const w = new Worker(`
-  const { parentPort } = require('worker_threads');
+  const { parentPort } = require('node:worker_threads');
   parentPort.on('message', () => {});
   `, { eval: true });