Update changelog

Author: cpsievert

CHANGELOG.md

@@ -15,7 +15,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 * The `ui.Chat()` component gains the following:
     * The `.on_user_submit()` decorator method now passes the user input to the decorated function. This makes it a bit easier to access the user input. See the new templates (mentioned below) for examples. (#1801)
-    * The `.append_message_stream()` method now returns the `reactive.extended_task` instance that it launches. Among other things, this allows you to access the final result of the stream when it completes. (#1846)
+    * A new `get_latest_stream_result()` method was added for an easy way to access the final result of the stream when it completes. (#1846)
+    * The `.append_message_stream()` method now returns the `reactive.extended_task` instance that it launches. (#1846)
 
 * `shiny create` includes new and improved `ui.Chat()` template options. Most of these templates leverage the new [`{chatlas}` package](https://posit-dev.github.io/chatlas/), our opinionated approach to interfacing with various LLM. (#1806)