air-gapped-install.asciidoc: add link to airgap install for Kib AI assistant (#2893)

* Add link to airgap install for AI assistant settings

* grammar fix

(cherry picked from commit 71edf7f)

Author: pgayvallet

docs/en/install-upgrade/air-gapped-install.asciidoc

@@ -72,7 +72,8 @@ Specifically:
 * To be able to use {kib} sample data, install or update hundreds of prebuilt alert rules, and explore available data integrations, you need to set up and configure the <<air-gapped-elastic-package-registry,{package-registry}>>.
 * To provide detection rule updates for {endpoint-sec} agents, you need to set up and configure the <<air-gapped-elastic-endpoint-artifact-repository,Elastic Endpoint Artifact Repository>>.
 * To access {ents} capabilities (in addition to the general search capabilities of {es}), you need to set up and configure <<air-gapped-enterprise-search,{ents}>>.
-* To access the APM integration, you need to set up and configure <<air-gapped-elastic-apm,Elastic APM>>. 
+* To access the APM integration, you need to set up and configure <<air-gapped-elastic-apm,Elastic APM>>.
+* To install and use the Elastic documentation for {kib} AI assistants, you need to set up and configure the <<air-gapped-kibana-product-documentation,Elastic product documentation for {kib}>>.
 
 [discrete]
 [[air-gapped-beats]]
@@ -163,6 +164,12 @@ Some {ml} features, like natural language processing (NLP), require you to deplo
 * {ml-docs}/ml-nlp-elser.html#air-gapped-install[Deploy ELSER in an air-gapped environment].
 * {eland-docs}/machine-learning.html#ml-nlp-pytorch-air-gapped[Install trained models in an air-gapped environment with Eland].
 
+[discrete]
+[[air-gapped-kibana-product-documentation]]
+==== 1.14 {kib} Product documentation for AI Assistants
+
+Detailed install and configuration instructions are available in the {kibana-ref}/ai-assistant-settings-kb.html[{kib} AI Assistants settings documentation].
+
 [discrete]
 [[air-gapped-kubernetes-and-openshift]]
 === 2. Kubernetes & OpenShift Install