docs: update broken MDN link for asynchronous programming

[j-dio]

Description

This PR fixes a broken MDN Web Docs link in the "How much JavaScript do you need to know to use Node.js?" getting-started guide.

The Issue:
In the "Asynchronous Programming" section, the link for "Asynchronous programming and callbacks" points to https://developer.mozilla.org/en-US/docs/JavaScript/Asynchronous/Introducing, which currently returns a 404 Page Not Found due to MDN restructuring their learning paths.

The Fix:
Updated the URL to point to the correct, newly relocated MDN article: https://developer.mozilla.org/en-US/docs/Learn_web_development/Extensions/Async_JS/Introducing.

Type of Change

• Documentation update / Link fix

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
nodejs-learn	Ready	Preview	Apr 21, 2026 3:38pm

[cursor]

PR Summary

Low Risk
Single documentation link update with no runtime or behavioral impact.

Overview
Fixes a broken MDN reference in the getting-started guide by updating the Asynchronous programming and callbacks link to MDN’s new Learn_web_development/Extensions/Async_JS/Introducing location.

^{Reviewed by Cursor Bugbot for commit c7f131e. Bugbot is set up for automated code reviews on this repo. Configure here.}

[Copilot]

Pull request overview

Fixes a broken MDN Web Docs link in the “How much JavaScript do you need to know to use Node.js?” getting-started guide by updating the “Asynchronous programming and callbacks” URL to MDN’s new Learn Web Development location.

Changes:

• Updated the MDN link for “Asynchronous programming and callbacks” to the new Learn_web_development/Extensions/Async_JS/Introducing path.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.