Correct old comment for a proper new one

src/plone/restapi/deserializer/dxfields.py

@@ -45,7 +45,7 @@ class DatetimeFieldDeserializer(DefaultFieldDeserializer):
     def __call__(self, value):
         try:
             # Parse ISO 8601 string with Zope's DateTime module
-            # and convert to a timezone naive datetime in local time
+            # and convert to a UTC based timezone as datetime
             value = DateTime(value).toZone('UTC').asdatetime()
         except (SyntaxError, DateTimeError) as e:
             raise ValueError(e.message)