gh-101100: Fix Sphinx warnings in whatsnew/2.3.rst (#112373)

Author: hugovk

Doc/tools/.nitignore

@@ -118,7 +118,6 @@ Doc/using/windows.rst
 Doc/whatsnew/2.0.rst
 Doc/whatsnew/2.1.rst
 Doc/whatsnew/2.2.rst
-Doc/whatsnew/2.3.rst
 Doc/whatsnew/2.4.rst
 Doc/whatsnew/2.5.rst
 Doc/whatsnew/2.6.rst