Merge pull request #8170 from kenjis/docs-getVar-not-recommened

docs: fix incomingrequest.rst and note to getVar()

Author: kenjis

user_guide_src/source/incoming/incomingrequest.rst

@@ -1,3 +1,3 @@
 <?php
 
-$something = $request->getVar('foo');
+$something = $request->getPost('foo');

user_guide_src/source/incoming/incomingrequest/008.php

@@ -10,8 +10,8 @@
  * }
  */
 
-$data = $request->getVar('foo');
+$data = $request->getJsonVar('foo');
 // $data = "bar"
 
-$data = $request->getVar('fizz.buzz');
+$data = $request->getJsonVar('fizz.buzz');
 // $data = "baz"

user_guide_src/source/incoming/incomingrequest/010.php

@@ -1,3 +1,3 @@
 <?php
 
-$email = $request->getVar('email', FILTER_SANITIZE_EMAIL);
+$email = $request->getPost('email', FILTER_SANITIZE_EMAIL);

user_guide_src/source/incoming/incomingrequest/014.php

@@ -0,0 +1,3 @@
+<?php
+
+$request->getGet('some_data');