Add missing note to get-teamChannel

Author: Rodrigo Diaz Acal

teams/teams-ps/teams/Get-TeamChannel.md

@@ -19,6 +19,9 @@ Get-TeamChannel -GroupId <String> [-MembershipType <String>] [<CommonParameters>
 
 ## DESCRIPTION
 
+> [!IMPORTANT]
+> Modules in the PS INT gallery for Microsoft Teams run on the /beta version in Microsoft Graph and are subject to change. Int modules can be install from here <https://www.poshtestgallery.com/packages/MicrosoftTeams>.
+
 ## EXAMPLES
 
 ### Example 1