Apply suggestions from code review

Co-authored-by: kenjis <kenji.uui@gmail.com>

Author: michalsn

user_guide_src/source/incoming/incomingrequest/039.php

@@ -1,6 +1,6 @@
 <?php
 
-// foo=one&bar=two&baz[]=10&baz[]=20
+// When the request body is 'foo=one&bar=two&baz[]=10&baz[]=20'
 var_dump($request->getRawInputVar('bar'));
 
 // Outputs: two
@@ -22,8 +22,8 @@
 /*
  * Outputs:
  * [
- *      10,
- *      20
+ *      '10',
+ *      '20'
  * ]
  */