Update release-1.13.md

added instructions to start working with ACEs while server bits are still running.

Author: lucabandMSFT

docs/spfx/release-1.13.md

@@ -41,12 +41,17 @@ npm install @microsoft/generator-sharepoint@next --global
 
 ## New features and capabilities
 
-- The biggest new part of this release is the extensibility model for the upcoming Viva Connections feature. The beta will allow you to create ACEs and test them in the hosted workbench.
+- The biggest new part of this release is the extensibility model for the upcoming Viva Connections feature. The beta will allow you to create Adaptive Card Extensions (ACEs) and test them in the hosted workbench.
   - *See [Overview of Viva Connections Extensibility](viva/overview-viva-connections.md) for more details.*
 - Update the Microsoft Teams SDK to v1.10.
 
+> [!NOTE]
+> The extensibility model for the upcoming Viva Connection feature is currently rolling in production and might not be available across all tenants yet. If you want to immediately start working with ACEs you can do that by creating a link to the workbench (for example `https://contoso.sharepoint.com/_layouts/15/workbench.aspx`) in a navigation node in a modern page. Then use that node to accessing the workbench.
+
+
 ## Deprecations and removed items in this release
 
 - **Local workbench removed**: This release will also mark the removal of the local workbench, as well as the removal of the on-prem questions in the Yeoman generator. On-prem is still supported, and the SPFx v1.12.1 Yeoman generator, as well as previous versions, continue to generate on-prem solutions. The hosted workbench is now the way to test your code.
 
     To configure the browser launch correctly, update the `initialPage` property within the **./config/serve.json** to point to your SharePoint Online tenant. For example: `https://contoso.sharepoint.com/_layouts/15/workbench.aspx`
+    Not performing that configuration task, will result in an error the firt time `gulp serve` runs.