doc: fix typo in dns docs

PR-URL: #20711
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: Yuta Hiroto <[email protected]>
Reviewed-By: Khaidi Chu <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: Daniel Bevenius <[email protected]>
Reviewed-By: Trivikram Kamat <[email protected]>
Reviewed-By: Michael Dawson <[email protected]>

doc/api/dns.md

@@ -66,7 +66,7 @@ An independent resolver for DNS requests.
 Note that creating a new resolver uses the default server settings. Setting
 the servers used for a resolver using
 [`resolver.setServers()`][`dns.setServers()`] does not affect
-other resolver:
+other resolvers:
 
 ```js
 const { Resolver } = require('dns');