whats new fix

Author: mongoKart

source/whats-new.txt

@@ -13,9 +13,6 @@ What's New
 Learn what's new in:
 
 * :ref:`Version 2.22 <version-2.22>`
-* :ref:`Version 2.21 <version-2.21>`
-* :ref:`Version 2.20 <version-2.20>`
-* :ref:`Version 2.19 <version-2.19>`
 
 .. _upcoming-breaking-changes: