Update changelogs

Author: petk

CHANGELOG.md

@@ -1,12 +1,11 @@
 # Changelog
 
-All notable changes to this project are documented in this file.
-
-The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
-and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+This document lists all notable changes across the main Git branches of this
+repository.
 
 ## PHP 8.5
 
+* C11 standard
 * ...
 
 ## PHP 8.4