fixed static check issue

Author: Manjusha.S

app/code/Magento/Checkout/Test/Mftf/Test/CustomerOrderSimpleProductTest.xml

@@ -1,3 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ /**
+  * Copyright © Magento, Inc. All rights reserved.
+  * See COPYING.txt for license details.
+  */
+-->
 <tests xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:mftf:Test/etc/testSchema.xsd">
     <test name="CustomerOrderSimpleProductTest">