doc: instantiate resolver object · nodejs/node@0b9ef68

Original file line number	Diff line number	Diff line change
`@@ -2315,6 +2315,8 @@ import { Resolver } from 'node:dns/promises';`
`2315`	`2315`
`2316`	`2316`	`await Readable.from([1, 2, 3, 4]).toArray(); // [1, 2, 3, 4]`
`2317`	`2317`
	`2318`	`+const resolver = new Resolver();`
	`2319`	`+`
`2318`	`2320`	`// Make dns queries concurrently using .map and collect`
`2319`	`2321`	`// the results into an array using toArray`
`2320`	`2322`	`const dnsResults = await Readable.from([`