update doc

tests/xlsx_to_csv.phpt

@@ -1,8 +1,10 @@
 --TEST--
 Check for vtiful presence
 --SKIPIF--
+<?php
 require __DIR__ . '/include/skipif.inc';
 skip_disable_reader();
+?>
 --FILE--
 <?php
 $config   = ['path' => './tests'];