Patch the extending ai actions article with a promise.

Author: dabrt

docs/ai_actions/extend_ai_actions.md

@@ -9,4 +9,6 @@ By extending AI Actions you can enhance the attractiveness of mundane content ma
 You can start from adding new action types that use the existing AI service, and evolve to integrating additional ones with completely new areas of application.
 For example, you could write a handler that connects to a translation model and use it to translate your website on-the-fly, or generate illustrations based on a body of an article.
 
-## ...
+!!! note "Revisit this page in the future"
+
+    Expect more information about extending the AI Actions feature to appear in this space soon.