docs: fix sample code

Fix incorrect results.

Author: kenjis

user_guide_src/source/incoming/incomingrequest/021.php

@@ -7,8 +7,8 @@
 echo $uri->getUserInfo();       // snoopy:password
 echo $uri->getHost();           // example.com
 echo $uri->getPort();           // 88
-echo $uri->getPath();           // /path/to/page
+echo $uri->getPath();           // path/to/page
 echo $uri->getQuery();          // foo=bar&bar=baz
-echo $uri->getSegments();       // ['path', 'to', 'page']
-echo $uri->getSegment(1);       // 'path'
+print_r($uri->getSegments());   // Array ( [0] => path [1] => to [2] => page )
+echo $uri->getSegment(1);       // path
 echo $uri->getTotalSegments();  // 3