docs: add changelog

Author: kenjis

user_guide_src/source/changelogs/v4.5.0.rst

@@ -233,6 +233,8 @@ Commands
 - Added ``spark config:check`` command to check Config values. See
   :ref:`confirming-config-values` for the details.
 - Added ``spark lang:find`` command to update translations keys. See :ref:`generating-translation-files-via-command` for the details.
+- The ``--dbgroup`` option has been added to the ``spark db:table`` command.
+  See :ref:`Database Commands <db-command-specify-the-dbgroup>`.
 
 Testing
 =======