docs: update description

It is not a method, but a function.

Author: kenjis

user_guide_src/source/general/helpers.rst

@@ -56,7 +56,7 @@ For example, to load the :doc:`../helpers/cookie_helper` file, which is named
 
 .. literalinclude:: helpers/002.php
 
-.. note:: The Helper loading method above does not return a value, so
+.. note:: The :php:func:`helper()` function does not return a value, so
     don't try to assign it to a variable. Just use it as shown.
 
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