AC-206: Corrected rules names in magento-only-ruleset

Author: sivaschenko

Magento2/magento-only-ruleset.xml

@@ -1,17 +1,17 @@
 <?xml version="1.0"?>
 <ruleset name="Magento2 Only">
     <description>Magento Coding Standard sniffs applicable for Magento Open Source development only</description>
-    <rule ref="Magento2.Header.License">
+    <rule ref="Magento2.Legacy.License">
         <severity>5</severity>
         <type>warning</type>
     </rule>
-    <rule ref="Magento2.Header.CopyrightAnotherExtensionsFiles">
+    <rule ref="Magento2.Legacy.CopyrightAnotherExtensionsFiles">
         <severity>5</severity>
         <type>warning</type>
         <exclude-pattern>*\.php$</exclude-pattern>
         <exclude-pattern>*\.phtml$</exclude-pattern>
     </rule>
-    <rule ref="Magento2.Header.Copyright">
+    <rule ref="Magento2.Legacy.Copyright">
         <severity>5</severity>
         <type>warning</type>
         <include-pattern>*\.php$</include-pattern>