bpo-42419: Correct 'deprecatations' is What's New 3.9 (GH-23421) (GH-23435)

(cherry picked from commit aa3a3521cef3998d4f9e7f7ff721163b6e3e5f39)
Co-authored-by: Quentin Hibon <qh.public@yahoo.com>
diff --git a/Doc/whatsnew/3.9.rst b/Doc/whatsnew/3.9.rst
index b89faf1..a638e54 100644
--- a/Doc/whatsnew/3.9.rst
+++ b/Doc/whatsnew/3.9.rst
@@ -135,8 +135,8 @@
 <devmode>` which helps to prepare your code to make it compatible with the
 next Python version.
 
-Note: a number of pre-existing deprecatations were removed in this version
-of Python as well. Consult the :ref:`removed-in-python-39` section.
+Note: a number of pre-existing deprecations were removed in this version of
+Python as well. Consult the :ref:`removed-in-python-39` section.
 
 
 New Features