conn is not defined in Example 2 on Promise-Wrapper.md

async function example1 () {
  const mysql = require('mysql2/promise');
  const conn = await mysql.createConnection({ database: test });
  const [rows, fields] = await conn.execute('select ?+? as sum', [2, 2]);
}

async function example2 () {
   const mysql = require('mysql2/promise');
   const pool = mysql.createPool({database: test});
   // execute in parallel, next console.log in 3 seconds
   await Promise.all([pool.query('select sleep(2)'), pool.query('select sleep(3)')]);
   console.log('3 seconds after');
   await pool.end();
   await conn.end();
}

From where does conn in example 2, if it has not been defined?
Example 2 would not be wrong?

Open Promise-Wrapper.md and inspect Example 2 alongside Example 1, focusing on the cleanup calls and the variables defined in that example. Done when the example no longer references an undefined connection and the documented pool-based parallel queries remain accurate.