fix(docs): update http api in introduction page

[MacMacky]

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Project	Deployment	Actions	Updated (UTC)
nodejs-learn	Ready	Preview	May 2, 2026 5:36am

[cursor]

PR Summary

Low Risk
Low risk documentation-only change that updates URLs to current Node.js API anchors; no runtime code is affected.

Overview
Updates pages/getting-started/introduction-to-nodejs.md to point the request event, http.IncomingMessage, and http.ServerResponse references at the current Node.js API anchor URLs (fixing broken/outdated links).

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