Update introduction-to-nodejs.md

[marceloalvesdesign]

• Fix inconsistency between the code snippet that calls end() with 'Hello World' with the example above. Remove newline.
• Add missing the before "mjs version"

[vercel]

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Project	Deployment	Actions	Updated (UTC)
nodejs-learn	Ready	Preview	Jun 25, 2026 12:27pm

[cursor]

PR Summary

Low Risk
Documentation-only wording and example consistency; no runtime or API impact.

Overview
Small copy edits in introduction-to-nodejs so the walkthrough matches the full server examples.

The inline res.end() snippet now uses 'Hello World' without a trailing newline, consistent with the CJS/MJS blocks above. The mjs instructions add the before “mjs version” for grammar.

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[github-actions]

👋 Codeowner Review Request

The following codeowners have been identified for the changed files:

Team reviewers: @nodejs/nodejs-website

Please review the changes when you have a chance. Thank you! 🙏