DOCSP-48488 NamespaceType (#526)

Author: jordan-smith721

source/whats-new.txt

@@ -19,6 +19,7 @@ What's New
 
 Learn what's new in:
 
+* :ref:`Version 3.3 <csharp-version-3.3>`
 * :ref:`Version 3.2 <csharp-version-3.2>`
 * :ref:`Version 3.1 <csharp-version-3.1>`
 * :ref:`Version 3.0 <csharp-version-3.0>`
@@ -34,6 +35,17 @@ Learn what's new in:
 
 .. _upcoming-breaking-changes:
 
+.. _csharp-version-3.3:
+
+What's New in 3.3
+-----------------
+
+The 3.3 driver release includes the following new features:
+
+- Adds a new ``NamespaceType`` field that indicates the type of the created object for
+  ``create`` events in the ``ChangeStreamDocument`` class. To learn more
+  about change streams, see the :ref:`csharp-change-streams` guide.
+
 .. _csharp-version-3.2:
 
 What's New in 3.2