whats new link

(cherry picked from commit b94572d)

Author: rustagir

source/whats-new.txt

@@ -70,6 +70,10 @@ improvements, and fixes:
 
 .. sharedinclude:: dbx/jvm/v5.2-wn-items.rst
 
+   .. replacement:: csot-link
+
+      the :ref:`kotlin-csot` guide
+
    .. replacement:: avs-index-link
 
       :ref:`kotlin-search-indexes` in the Indexes guide