MAGETWO-64515: change comment in file due to PR risk

Author: vzabaznov

phpserver/router.php

@@ -32,14 +32,10 @@
     echo 'debug: '.$val.PHP_EOL.'<br/>'.PHP_EOL;
 };
 
-/**
- * Caution, this is very experimental stuff
- * no guarantee for working result
- * has tons of potential big security holes
- */
+/* Note: the code below is experimental and not intended to be used outside development environment.
+The code is protected against running outside of PHP built-in web server. */
 
 if (php_sapi_name() === 'cli-server') {
-
     $debug($_SERVER["REQUEST_URI"]);
     if (preg_match('/^\/(index|get|static)\.php(\/)?/', $_SERVER["REQUEST_URI"])) {
         return false;    // serve the requested resource as-is.