doc: remove unused reference to Array.isArray() in util documentation

Author: miguelmarcondesf

doc/api/util.md

@@ -3678,7 +3678,6 @@ similar built-in functionality through [`Object.assign()`][].
 [WHATWG Encoding Standard]: https://encoding.spec.whatwg.org/
 [`'uncaughtException'`]: process.md#event-uncaughtexception
 [`'warning'`]: process.md#event-warning
-[`Array.isArray()`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/isArray
 [`ArrayBuffer.isView()`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer/isView
 [`JSON.stringify()`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify
 [`MIMEparams`]: #class-utilmimeparams