[misc] XAR format.

xwiki-platform-core/xwiki-platform-repository/xwiki-platform-repository-server-ui/src/main/resources/Extension/WebPreferences.xml

 <?xml version="1.0" encoding="UTF-8"?>
+
 <!--
  * See the NOTICE file distributed with this work for additional
  * information regarding copyright ownership.

xwiki-platform-core/xwiki-platform-repository/xwiki-platform-repository-server-ui/src/main/resources/ExtensionMetadata/WebPreferences.xml

 <?xml version="1.0" encoding="UTF-8"?>
+
 <!--
  * See the NOTICE file distributed with this work for additional
  * information regarding copyright ownership.

xwiki-platform-core/xwiki-platform-wiki/xwiki-platform-wiki-ui/xwiki-platform-wiki-ui-mainwiki/src/main/resources/WikiManager/AdminWikisRightsSheet.xml

 <?xml version="1.0" encoding="UTF-8"?>
+
 <!--
  * See the NOTICE file distributed with this work for additional
  * information regarding copyright ownership.

xwiki-platform-core/xwiki-platform-wiki/xwiki-platform-wiki-ui/xwiki-platform-wiki-ui-mainwiki/src/main/resources/WikiManager/AdminWikisTemplatesSheet.xml

 <?xml version="1.0" encoding="UTF-8"?>
+
 <!--
  * See the NOTICE file distributed with this work for additional
  * information regarding copyright ownership.