docs: add two bug fixes

Author: kenjis

user_guide_src/source/changelogs/v4.2.12.rst

@@ -14,5 +14,7 @@ Bugs Fixed
 
 - Fixed ``Request::getIPaddress()`` causes an error on CLI.
 - Fixed ``link_tag()`` missing ``type="application/rss+xml"``.
+- Fixed ``spark migrate:status`` shows incorrect filenames when format is ``Y_m_d_His_``.
+- Fixed an error when ``Model::save()`` saves an object if ``$useAutoIncrement`` is false.
 
 See the repo's `CHANGELOG.md <https://github.com/codeigniter4/CodeIgniter4/blob/develop/CHANGELOG.md>`_ for a complete list of bugs fixed.