Backport PR #40137: DOC: 1.2.3 release date (#40165)

Co-authored-by: Simon Hawkins <simonjayhawkins@gmail.com>

doc/source/whatsnew/v1.2.3.rst

@@ -1,6 +1,6 @@
 .. _whatsnew_123:
 
-What's new in 1.2.3 (March ??, 2021)
+What's new in 1.2.3 (March 02, 2021)
 ------------------------------------
 
 These are the changes in pandas 1.2.3. See :ref:`release` for a full changelog
@@ -19,33 +19,8 @@ Fixed regressions
 - Fixed regression in nullable integer unary ops propagating mask on assignment (:issue:`39943`)
 - Fixed regression in :meth:`DataFrame.__setitem__` not aligning :class:`DataFrame` on right-hand side for boolean indexer (:issue:`39931`)
 - Fixed regression in :meth:`~DataFrame.to_json` failing to use ``compression`` with URL-like paths that are internally opened in binary mode or with user-provided file objects that are opened in binary mode (:issue:`39985`)
-- Fixed regression in :meth:`~Series.sort_index` and :meth:`~DataFrame.sort_index`,
-  which exited with an ungraceful error when having kwarg ``ascending=None`` passed (:issue:`39434`).
-  Passing ``ascending=None`` is still considered invalid,
-  and the new error message suggests a proper usage
-  (``ascending`` must be a boolean or a list-like boolean).
+- Fixed regression in :meth:`Series.sort_index` and :meth:`DataFrame.sort_index`, which exited with an ungraceful error when having kwarg ``ascending=None`` passed. Passing ``ascending=None`` is still considered invalid, and the improved error message suggests a proper usage (``ascending`` must be a boolean or a list-like of boolean) (:issue:`39434`)
 - Fixed regression in :meth:`DataFrame.transform` and :meth:`Series.transform` giving incorrect column labels when passed a dictionary with a mix of list and non-list values (:issue:`40018`)
--
-
-.. ---------------------------------------------------------------------------
-
-.. _whatsnew_123.bug_fixes:
-
-Bug fixes
-~~~~~~~~~
-
--
--
-
-.. ---------------------------------------------------------------------------
-
-.. _whatsnew_123.other:
-
-Other
-~~~~~
-
--
--
 
 .. ---------------------------------------------------------------------------