docs: fix sample code

kenjis · kenjis · commit 93da70029efe · 2023-12-06T20:27:00.000+09:00
diff --git a/user_guide_src/source/general/helpers/008.php b/user_guide_src/source/general/helpers/008.php
@@ -1,6 +1,7 @@
 <?php
 
 // app/Helpers/info_helper.php
+use CodeIgniter\CodeIgniter;
 
 /**
  * Returns CodeIgniter's version.
