Assistant changelog (#839)

* assistant changelog

* reviewer feedback

* clarify "Ask AI"

Author: ethanpalm

changelog.mdx

@@ -4,6 +4,18 @@ description: "New updates and improvements"
 mode: "center"
 ---
 
+<Update label="June 2025">
+  ## AI assistant updates
+
+  - Improved accuracy through agentic RAG with tool calling
+  - Provides navigable links to referenced pages so that users can go directly to the source of answers
+  - Copy shortcut for code examples generated by assistant
+  - "Ask AI" shortcut on code blocks in documentation to generate explanations from the assistant
+
+  Learn more in the [assistant docs](/guides/assistant).
+
+</Update>
+
 <Update label="May 2025">
   ## API playground stability updates