docs: Update changelog

Author: neznaika0

user_guide_src/source/changelogs/v4.5.8.rst

@@ -14,6 +14,11 @@ Release Date: Unreleased
 BREAKING
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+Header
+======
+
+Added validation of the name and value for ``CodeIgniter\HTTP\Header``. Some specific headers can cause the system to crash.
+
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 Message Changes
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@@ -31,6 +36,7 @@ Bugs Fixed
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 - **Database:** Fixed a bug where ``Builder::affectedRows()`` threw an error when the previous query call failed in ``Postgre`` and ``SQLSRV`` drivers.
+- **Header:** Improper headers parsing. Line breaks and other incorrect characters in headers (``CodeIgniter\HTTP\Header``) may break the HTTP request. See https://datatracker.ietf.org/doc/html/rfc7230 for more details.
 
 See the repo's
 `CHANGELOG.md <https://github.com/codeigniter4/CodeIgniter4/blob/develop/CHANGELOG.md>`_