doc: use console.error for error case in child_process and dgram

console.error is more suitable than console.log for error case.

PR-URL: #45690
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: deokjinkim

doc/api/child_process.md

@@ -272,7 +272,7 @@ const { exec } = require('node:child_process');
 const controller = new AbortController();
 const { signal } = controller;
 const child = exec('grep ssh', { signal }, (error) => {
-  console.log(error); // an AbortError
+  console.error(error); // an AbortError
 });
 controller.abort();
 ```
@@ -384,7 +384,7 @@ const { execFile } = require('node:child_process');
 const controller = new AbortController();
 const { signal } = controller;
 const child = execFile('node', ['--version'], { signal }, (error) => {
-  console.log(error); // an AbortError
+  console.error(error); // an AbortError
 });
 controller.abort();
 ```

doc/api/dgram.md

@@ -16,7 +16,7 @@ import dgram from 'node:dgram';
 const server = dgram.createSocket('udp4');
 
 server.on('error', (err) => {
-  console.log(`server error:\n${err.stack}`);
+  console.error(`server error:\n${err.stack}`);
   server.close();
 });
 
@@ -38,7 +38,7 @@ const dgram = require('node:dgram');
 const server = dgram.createSocket('udp4');
 
 server.on('error', (err) => {
-  console.log(`server error:\n${err.stack}`);
+  console.error(`server error:\n${err.stack}`);
   server.close();
 });
 
@@ -268,7 +268,7 @@ import dgram from 'node:dgram';
 const server = dgram.createSocket('udp4');
 
 server.on('error', (err) => {
-  console.log(`server error:\n${err.stack}`);
+  console.error(`server error:\n${err.stack}`);
   server.close();
 });
 
@@ -290,7 +290,7 @@ const dgram = require('node:dgram');
 const server = dgram.createSocket('udp4');
 
 server.on('error', (err) => {
-  console.log(`server error:\n${err.stack}`);
+  console.error(`server error:\n${err.stack}`);
   server.close();
 });