Update prerequisites for Copilot in Visual Studio (#54903)

Author: hubwriter

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

@@ -172,8 +172,11 @@ To leave feedback about the {% data variables.product.prodname_copilot_chat %} e
 
 * **Access to {% data variables.product.prodname_copilot %}**. See [AUTOTITLE](/copilot/about-github-copilot/what-is-github-copilot#getting-access-to-copilot).
 * **{% data variables.product.prodname_vs %} 2022 version 17.8 or later**. See [Install {% data variables.product.prodname_vs %}](https://learn.microsoft.com/visualstudio/install/install-visual-studio) in the {% data variables.product.prodname_vs %} documentation.
-* **{% data variables.product.prodname_copilot %} extension**. See [Install {% data variables.product.prodname_copilot %} in {% data variables.product.prodname_vs %}](https://learn.microsoft.com/visualstudio/ide/visual-studio-github-copilot-install-and-states) in the {% data variables.product.prodname_vs %} documentation.
-* **{% data variables.product.prodname_copilot_chat %} extension**. See [Install {% data variables.product.prodname_copilot %} in {% data variables.product.prodname_vs %}](https://learn.microsoft.com/visualstudio/ide/visual-studio-github-copilot-install-and-states) in the {% data variables.product.prodname_vs %} documentation.
+* _For {% data variables.product.prodname_vs %} 17.8 and 17.9:_
+  * **{% data variables.product.prodname_copilot %} extension**. See [Install {% data variables.product.prodname_copilot %} in {% data variables.product.prodname_vs %}](https://learn.microsoft.com/visualstudio/ide/visual-studio-github-copilot-install-and-states) in the {% data variables.product.prodname_vs %} documentation.
+  * **{% data variables.product.prodname_copilot_chat %} extension**. See [Install {% data variables.product.prodname_copilot %} in {% data variables.product.prodname_vs %}](https://learn.microsoft.com/visualstudio/ide/visual-studio-github-copilot-install-and-states) in the {% data variables.product.prodname_vs %} documentation.
+
+  _{% data variables.product.prodname_vs %} 17.10 and later have the {% data variables.product.prodname_copilot %} and {% data variables.product.prodname_copilot_chat %} extensions built in. You don't need to install them separately._
 * **Sign in to {% data variables.product.company_short %} in {% data variables.product.prodname_vs %}**. If you experience authentication issues, see [AUTOTITLE](/copilot/troubleshooting-github-copilot/troubleshooting-issues-with-github-copilot-chat#troubleshooting-authentication-issues-in-your-editor).
 
 {% data reusables.copilot.chat-access-denied %}