doc: fix typo in parseArgs default value

Refs: nodejs#44631

Author: tniessen

doc/api/util.md

@@ -1407,7 +1407,7 @@ changes:
     * `short` {string} A single character alias for the option.
     * `default` {string | boolean | string\[] | boolean\[]} The default option
       value when it is not set by args. It must be of the same type as the
-      the `type` property. When `multiple` is `true`, it must be an array.
+      `type` property. When `multiple` is `true`, it must be an array.
   * `strict` {boolean} Should an error be thrown when unknown arguments
     are encountered, or when arguments are passed that do not match the
     `type` configured in `options`.