Added more detailed description about GroupId in New-AzPrivateLinkSer…

src/Network/Network/ChangeLog.md

@@ -19,6 +19,7 @@
 --->
 
 ## Upcoming Release
+* Added more detailed description about GroupId in `New-AzPrivateLinkServiceConnection`
 * Updated cmdlets to enable setting of PrivateRange on AzureFirewallPolicy.
     - `New-AzFirewallPolicy`
     - `Set-AzFirewallPolicy`

src/Network/Network/PrivateEndpoint/PrivateLinkServiceConnection/NewAzurePrivateLinkServiceConnectionCommand.cs

@@ -53,7 +53,7 @@ public class NewAzurePrivateLinkServiceConnectionCommand : NetworkBaseCmdlet
 
         [Parameter(
             Mandatory = false,
-            HelpMessage = "The list of group id.")]
+            HelpMessage = "The list of group id. You can use '(Get-AzPrivateLinkResource -PrivateLinkResourceId ${privateLinkResourceId}).GroupId' to get the supported group ids.")]
         public string[] GroupId { get; set; }
 
         [Parameter(

src/Network/Network/help/New-AzPrivateLinkServiceConnection.md

@@ -64,7 +64,7 @@ Accept wildcard characters: False
 ```
 
 ### -GroupId
-The list of group id.
+The list of group id. You can use '(Get-AzPrivateLinkResource -PrivateLinkResourceId ${privateLinkResourceId}).GroupId' to get the supported group ids.
 
 ```yaml
 Type: System.String[]