#129 [PHP][Manual]Modify return values of cubrid_close_request/cubrid_close_prepare

[Jira Trac]

[cubrid_close_request|http://www.php.net/manual/en/function.cubrid-close-request.php] and [cubrid_close_prepare|http://www.php.net/manual/en/function.cubrid-close-prepare.php] will not return FALSE when process is unsuccessful. Please update the manual and modify the related contents about return values.