Add release note

Author: timhoffm

doc/source/whatsnew/v2.3.0.rst

@@ -32,6 +32,9 @@ enhancement1
 Other enhancements
 ^^^^^^^^^^^^^^^^^^
 
+- :func:`pandas.merge` propagates the ``attrs`` attribute to the result if all
+  inputs have identical ``attrs``, as has so far already been the case for
+  :func:`pandas.copy`.
 - :meth:`pandas.api.interchange.from_dataframe` now uses the `PyCapsule Interface <https://arrow.apache.org/docs/format/CDataInterface/PyCapsuleInterface.html>`_ if available, only falling back to the Dataframe Interchange Protocol if that fails (:issue:`60739`)
 - The semantics for the ``copy`` keyword in ``__array__`` methods (i.e. called
   when using ``np.array()`` or ``np.asarray()`` on pandas objects) has been