DOCSP-41865: datetime serializers

Author: rustagir

source/whats-new.txt

@@ -26,14 +26,19 @@ Learn what's new in:
 What's New in 5.2
 -----------------
 
-New features of the 4.11 driver release include:
+The 5.2 driver release includes the following new features,
+improvements, and fixes:
 
 .. sharedinclude:: dbx/jvm/v5.2-wn-items.rst
 
    .. replacement:: avs-index-link
 
       :ref:`kotlin-search-indexes` in the Indexes guide
 
+- Adds support for serializers from the ``kotlinx-datetime`` library
+  that let you map to BSON as the expected types. To learn more, see the
+  :ref:`fundamentals-kotlin-serialization` guide.
+
 .. _kotlin-coroutine-version-5.1.3:
 
 What's New in 5.1.3