Update get-started-create-site-design.md (SharePoint#7345)

Author: Holland-ODSP

docs/declarative-customization/get-started-create-site-design.md

@@ -109,6 +109,7 @@ The previous cmdlet creates a new site template named Contoso customer tracking.
 | WebTemplate  | 64 | Team site template |
 | WebTemplate 1 | 1 | Team site (with group creation disabled) |
 | WebTemplate    | 68 | Communication site template |
+| WebTemplate    | 69 | Channel site template |
 
 
 The JSON response displays the **ID** of the new site template. You can use it in subsequent cmdlets to update or modify the site template.
@@ -155,6 +156,10 @@ Apply a published site template to a new or existing hub site. Then, all associa
 
 You can also use the `Set-SPOHubSite` cmdlet. Review the [PowerShell cmdlets for SharePoint hub sites](../features/hub-site/hub-site-powershell.md) article.
 
+>[!NOTE]
+> [Channel sites](/sharepoint/teams-connected-sites) are automatically blocked from joining a hub site.
+
+
 ## See also
 
 - [SharePoint site template and site script overview](site-design-overview.md)