Add stub for agent builder models page (#3362)

Stubs out a stub page to unlock doc links in Kibana etc.

Author: leemthompo

solutions/search/agent-builder/models.md

@@ -0,0 +1,15 @@
+---
+navigation_title: "Use different models"
+applies_to:
+  stack: preview 9.2
+  serverless:
+    elasticsearch: preview
+---
+
+:::{warning}
+These pages are currently hidden from the docs TOC and have `noindexed` meta headers.
+
+**Go to the docs [landing page](/solutions/search/elastic-agent-builder.md).**
+:::
+
+# Using different models in {{agent-builder}}

solutions/toc.yml

@@ -46,6 +46,7 @@ toc:
           - file: search/using-openai-compatible-models.md
       - hidden: search/elastic-agent-builder.md
       - hidden: search/agent-builder/get-started.md
+      - hidden: search/agent-builder/models.md
       - hidden: search/agent-builder/chat.md
       - hidden: search/agent-builder/agent-builder-agents.md
       - hidden: search/agent-builder/tools.md