first draft (#4803)

(cherry picked from commit ca449a8)

docs/assistant/security-assistant.asciidoc

@@ -191,6 +191,8 @@ When this feature is enabled, AI Assistant can help you write an {esql} query fo
 . Turn on the *Knowledge Base* option.
 . Click *Save*. The knowledge base is now active. A quick prompt for {esql} queries becomes available, which provides a good starting point for your {esql} conversations and questions. 
 
+NOTE: To update AI Assistant so that it uses the most current {esql} documentation to answer your questions, click **Delete** next to **Knowledge Base**, and toggle the **Knowledge Base** slider off and then on. 
+
 [discrete]
 [[rag-for-alerts]]
 ==== Knowledge base for alerts