Update introduction-to-nodejs.md (#6482)

ReferenceError: http is not defined fixed in docs

Author: ssakib4040

pages/en/about/index.mdx

@@ -16,7 +16,7 @@ const { createServer } = require('node:http');
 const hostname = '127.0.0.1';
 const port = 3000;
 
-const server = http.createServer((req, res) => {
+const server = createServer((req, res) => {
   res.statusCode = 200;
   res.setHeader('Content-Type', 'text/plain');
   res.end('Hello World');
@@ -33,7 +33,7 @@ import { createServer } from 'node:http';
 const hostname = '127.0.0.1';
 const port = 3000;
 
-const server = http.createServer((req, res) => {
+const server = createServer((req, res) => {
   res.statusCode = 200;
   res.setHeader('Content-Type', 'text/plain');
   res.end('Hello World');

pages/en/learn/getting-started/introduction-to-nodejs.md

@@ -30,7 +30,7 @@ const { createServer } = require('node:http');
 const hostname = '127.0.0.1';
 const port = 3000;
 
-const server = http.createServer((req, res) => {
+const server = createServer((req, res) => {
   res.statusCode = 200;
   res.setHeader('Content-Type', 'text/plain');
   res.end('Hello World');
@@ -47,7 +47,7 @@ import { createServer } from 'node:http';
 const hostname = '127.0.0.1';
 const port = 3000;
 
-const server = http.createServer((req, res) => {
+const server = createServer((req, res) => {
   res.statusCode = 200;
   res.setHeader('Content-Type', 'text/plain');
   res.end('Hello World');