docs(combobox): fix usage example error (#12404)
docs(combobox): fix usage example error (#12404)

* Fix Docs Error

Fix length of null error for the settings for usage in docs

* docs(combobox): fix usage lint error

Co-authored-by: Andrew Henry <427fe9622d5b827faa212a82678f75b568cfbbd0@gmail.com>
vuetifyjs/vuetify,vuetifyjs/vuetify,vuetifyjs/vuetify,vuetifyjs/vuetify