Fix documentation with new config variable name

Thomas Bruederli

2013-08-14 465fc3a4c7de3f41eb09468adf0c03fb424f353e

Fix documentation with new config variable name

 plugins/additional_message_headers/additional_message_headers.php

@@ -7,7 +7,7 @@
 * to or remove them from outgoing messages.
 *
 * Enable the plugin in config.inc.php and add your desired headers:
 * $rcmail_config['additional_message_headers'] = array('User-Agent');
 * $config['additional_message_headers'] = array('User-Agent' => 'My-Very-Own-Webmail');
 *
 * @version @package_version@
 * @author Ziba Scott