docs: add items

Author: kenjis

user_guide_src/source/concepts/security.rst

@@ -38,8 +38,9 @@ OWASP recommendations
 CodeIgniter provisions
 ======================
 
-- :doc:`HTTP library <../incoming/incomingrequest>` provides for :ref:`input field filtering <incomingrequest-filtering-input-data>` & content metadata
+- :ref:`invalidchars` filter
 - :doc:`../libraries/validation` library
+- :doc:`HTTP library <../incoming/incomingrequest>` provides for :ref:`input field filtering <incomingrequest-filtering-input-data>` & content metadata
 
 *********************************************
 A2 Weak authentication and session management

user_guide_src/source/incoming/filters.rst

@@ -204,6 +204,8 @@ The filters bundled with CodeIgniter4 are: :doc:`Honeypot <../libraries/honeypot
 
 .. note:: The filters are executed in the order defined in the config file. However, if enabled, ``DebugToolbar`` is always executed last because it should be able to capture everything that happens in the other filters.
 
+.. _invalidchars:
+
 InvalidChars
 =============