Added missing parameter description

Author: konarshankar07

app/code/Magento/Ui/view/base/web/js/modal/modal.js

@@ -104,6 +104,7 @@ define([
                 /**
                  * Escape key press handler,
                  * close modal window
+                 * @param {Object} event - event
                  */
                 escapeKey: function (event) {
                     if (this.options.isOpen && this.modal.find(document.activeElement).length ||