doc: add node: prefix for all core modules

Some core modules can be loaded with or without the `node:` scheme. This commit
updates the docs to use the prefix everywhere, for consistency.

doc/api/async_context.md

@@ -15,14 +15,14 @@ or any other asynchronous duration. It is similar to thread-local storage
 in other languages.
 
 The `AsyncLocalStorage` and `AsyncResource` classes are part of the
-`async_hooks` module:
+`node:async_hooks` module:
 
 ```mjs
-import { AsyncLocalStorage, AsyncResource } from 'async_hooks';
+import { AsyncLocalStorage, AsyncResource } from 'node:async_hooks';
 ```
 
 ```cjs
-const { AsyncLocalStorage, AsyncResource } = require('async_hooks');
+const { AsyncLocalStorage, AsyncResource } = require('node:async_hooks');
 ```
 
 ## Class: `AsyncLocalStorage`
@@ -39,18 +39,18 @@ changes:
 
 This class creates stores that stay coherent through asynchronous operations.
 
-While you can create your own implementation on top of the `async_hooks` module,
-`AsyncLocalStorage` should be preferred as it is a performant and memory safe
-implementation that involves significant optimizations that are non-obvious to
-implement.
+While you can create your own implementation on top of the `node:async_hooks`
+module, `AsyncLocalStorage` should be preferred as it is a performant and memory
+safe implementation that involves significant optimizations that are non-obvious
+to implement.
 
 The following example uses `AsyncLocalStorage` to build a simple logger
 that assigns IDs to incoming HTTP requests and includes them in messages
 logged within each request.
 
 ```mjs
-import http from 'http';
-import { AsyncLocalStorage } from 'async_hooks';
+import http from 'node:http';
+import { AsyncLocalStorage } from 'node:async_hooks';
 
 const asyncLocalStorage = new AsyncLocalStorage();
 
@@ -81,8 +81,8 @@ http.get('http://localhost:8080');
 ```
 
 ```cjs
-const http = require('http');
-const { AsyncLocalStorage } = require('async_hooks');
+const http = require('node:http');
+const { AsyncLocalStorage } = require('node:async_hooks');
 
 const asyncLocalStorage = new AsyncLocalStorage();
 
@@ -348,7 +348,7 @@ The `init` hook will trigger when an `AsyncResource` is instantiated.
 The following is an overview of the `AsyncResource` API.
 
 ```mjs
-import { AsyncResource, executionAsyncId } from 'async_hooks';
+import { AsyncResource, executionAsyncId } from 'node:async_hooks';
 
 // AsyncResource() is meant to be extended. Instantiating a
 // new AsyncResource() also triggers init. If triggerAsyncId is omitted then
@@ -376,7 +376,7 @@ asyncResource.triggerAsyncId();
 ```
 
 ```cjs
-const { AsyncResource, executionAsyncId } = require('async_hooks');
+const { AsyncResource, executionAsyncId } = require('node:async_hooks');
 
 // AsyncResource() is meant to be extended. Instantiating a
 // new AsyncResource() also triggers init. If triggerAsyncId is omitted then
@@ -535,14 +535,14 @@ Assuming that the task is adding two numbers, using a file named
 `task_processor.js` with the following content:
 
 ```mjs
-import { parentPort } from 'worker_threads';
+import { parentPort } from 'node:worker_threads';
 parentPort.on('message', (task) => {
   parentPort.postMessage(task.a + task.b);
 });
 ```
 
 ```cjs
-const { parentPort } = require('worker_threads');
+const { parentPort } = require('node:worker_threads');
 parentPort.on('message', (task) => {
   parentPort.postMessage(task.a + task.b);
 });
@@ -551,10 +551,10 @@ parentPort.on('message', (task) => {
 a Worker pool around it could use the following structure:
 
 ```mjs
-import { AsyncResource } from 'async_hooks';
-import { EventEmitter } from 'events';
-import path from 'path';
-import { Worker } from 'worker_threads';
+import { AsyncResource } from 'node:async_hooks';
+import { EventEmitter } from 'node:events';
+import path from 'node:path';
+import { Worker } from 'node:worker_threads';
 
 const kTaskInfo = Symbol('kTaskInfo');
 const kWorkerFreedEvent = Symbol('kWorkerFreedEvent');
@@ -639,10 +639,10 @@ export default class WorkerPool extends EventEmitter {
 ```
 
 ```cjs
-const { AsyncResource } = require('async_hooks');
-const { EventEmitter } = require('events');
-const path = require('path');
-const { Worker } = require('worker_threads');
+const { AsyncResource } = require('node:async_hooks');
+const { EventEmitter } = require('node:events');
+const path = require('node:path');
+const { Worker } = require('node:worker_threads');
 
 const kTaskInfo = Symbol('kTaskInfo');
 const kWorkerFreedEvent = Symbol('kWorkerFreedEvent');
@@ -738,7 +738,7 @@ This pool could be used as follows:
 
 ```mjs
 import WorkerPool from './worker_pool.js';
-import os from 'os';
+import os from 'node:os';
 
 const pool = new WorkerPool(os.cpus().length);
 
@@ -754,7 +754,7 @@ for (let i = 0; i < 10; i++) {
 
 ```cjs
 const WorkerPool = require('./worker_pool.js');
-const os = require('os');
+const os = require('node:os');
 
 const pool = new WorkerPool(os.cpus().length);
 
@@ -779,8 +779,8 @@ associate an event listener with the correct execution context. The same
 approach can be applied to a [`Stream`][] or a similar event-driven class.
 
 ```mjs
-import { createServer } from 'http';
-import { AsyncResource, executionAsyncId } from 'async_hooks';
+import { createServer } from 'node:http';
+import { AsyncResource, executionAsyncId } from 'node:async_hooks';
 
 const server = createServer((req, res) => {
   req.on('close', AsyncResource.bind(() => {
@@ -794,8 +794,8 @@ const server = createServer((req, res) => {
 ```
 
 ```cjs
-const { createServer } = require('http');
-const { AsyncResource, executionAsyncId } = require('async_hooks');
+const { createServer } = require('node:http');
+const { AsyncResource, executionAsyncId } = require('node:async_hooks');
 
 const server = createServer((req, res) => {
   req.on('close', AsyncResource.bind(() => {