docs: add changelog

Author: kenjis

user_guide_src/source/changelogs/v4.3.8.rst

@@ -24,6 +24,11 @@ Deprecations
 Bugs Fixed
 **********
 
+- **Controller Filters:** In previous versions, ``['except' => []]`` or ``['except' => '']``
+  meant "except all". The bug has been fixed, and now
+    - ``['except' => []]`` means to exclude nothing.
+    - ``['except' => '']`` means to exclude the baseURL only.
+
 See the repo's
 `CHANGELOG.md <https://github.com/codeigniter4/CodeIgniter4/blob/develop/CHANGELOG.md>`_
 for a complete list of bugs fixed.