Fix docblock indentation for countries

@mikejolly prefer to have docblock indentation in spaces rather than tab

i18n/countries.php

@@ -4,9 +4,9 @@
  *
  * Returns an array of countries and codes.
  *
- * @author 		WooThemes
- * @category 	i18n
- * @package 	WooCommerce/i18n
+ * @author      WooThemes
+ * @category    i18n
+ * @package     WooCommerce/i18n
  * @version     2.2.0
  */
 
@@ -257,4 +257,4 @@ return array(
 	'YE' => __( 'Yemen', 'woocommerce' ),
 	'ZM' => __( 'Zambia', 'woocommerce' ),
 	'ZW' => __( 'Zimbabwe', 'woocommerce' )
-);
+);