gh-101100: Fix Sphinx warnings in whatsnew/2.2.rst (#112366)

Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>

Author: hugovk

Doc/tools/.nitignore

@@ -90,7 +90,6 @@ Doc/tutorial/datastructures.rst
 Doc/using/windows.rst
 Doc/whatsnew/2.0.rst
 Doc/whatsnew/2.1.rst
-Doc/whatsnew/2.2.rst
 Doc/whatsnew/2.4.rst
 Doc/whatsnew/2.5.rst
 Doc/whatsnew/2.6.rst