Add missing changelog entries

Refs: #3372

Author: kdeldycke

CHANGES.rst

@@ -17,6 +17,9 @@ Unreleased
         ``dict[str, Any]``.
     -   :class:`CompositeParamType` and the number-range base are now
         generic with abstract methods.
+-   Refactor ``convert_type`` to extract type inference into a private
+    ``_guess_type`` helper, and add :func:`typing.overload` signatures.
+    :pr:`3372`
 -   :class:`Parameter` typing improvements. :pr:`2805`
 
     -   :class:`Parameter` is now an abstract base class, making explicit