[8.x](backport #4211) [Observability AI Assistant] Add explicit text about function calling (#4259)

* [Observability AI Assistant] Add explicit text about function calling (#4211)

* Add explicit text about function calling

* Integrate Luca's feedback

* Update docs/en/observability/observability-ai-assistant.asciidoc

Co-authored-by: Luca Belluccini <[email protected]>

* Update docs/en/observability/observability-ai-assistant.asciidoc

Co-authored-by: DeDe Morton <[email protected]>

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Co-authored-by: Luca Belluccini <[email protected]>
Co-authored-by: DeDe Morton <[email protected]>
(cherry picked from commit 0a1b3f8)

* Delete docs/en/serverless directory

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Co-authored-by: Arianna Laudazzi <[email protected]>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

Author: 3 people

docs/en/observability/observability-ai-assistant.asciidoc

@@ -193,6 +193,13 @@ This opens the AI Assistant flyout, where you can ask the assistant questions ab
 [role="screenshot"]
 image::images/obs-ai-chat.png[Observability AI assistant chat, 60%]
 
+[IMPORTANT]
+====
+Asking questions about your data requires `function calling`, which enables LLMs to reliably interact with third-party generative AI providers to perform searches or run advanced functions using customer data.
+
+When the {observability} AI Assistant performs searches in the cluster, the queries are run with the same level of permissions as the user.
+====
+
 [discrete]
 [[obs-ai-functions]]
 === Suggest functions