fixed proptyoes of example

Author: sagiv.bengiat

src/docs/components/ItemWithLink.js

@@ -1,4 +1,5 @@
 import React from "react";
+import PropTypes from "prop-types";
 import Item from "./SimpleItem";
 
 const ItemWithLink = ({ tabIndex, text }) => (
@@ -9,4 +10,9 @@ const ItemWithLink = ({ tabIndex, text }) => (
   </Item>
 );
 
+ItemWithLink.propTypes = {
+  text: PropTypes.oneOfType([PropTypes.number, PropTypes.string]),
+  tabIndex: PropTypes.oneOfType([PropTypes.number, PropTypes.string])
+};
+
 export default ItemWithLink;