Fix jslint errors - 3

Author: Pieter Cappelle

app/code/Magento/Catalog/view/adminhtml/web/catalog/product/attribute/unique-validate.js

@@ -16,6 +16,7 @@ define([
                 message: '',
                 uniqueClass: 'required-unique'
             }, config),
+            /** @inheritdoc */
             messager = function () {
                 return msg;
             };