Insiders not for model-picker docs (#52373)

Co-authored-by: Sam Browning <[email protected]>

content/copilot/using-github-copilot/asking-github-copilot-questions-in-your-ide.md

@@ -31,6 +31,8 @@ shortTitle: Chat in IDE
 
 ### Changing your AI model
 
+The model picker in Chat view is a pre-release feature and requires the latest version of [VS Code Insiders](https://code.visualstudio.com/insiders/), as well as the {% data variables.product.prodname_copilot_short %} pre-release extension.
+
 {% data reusables.copilot.model-picker-enable-preview-features %}
 {% data reusables.copilot.open-chat-vs-code %}
 1. In the bottom right of the chat view, select the **CURRENT-MODEL** {% octicon "chevron-down" aria-hidden="true" %} dropdown menu, then click the AI model of your choice.