Update warning message when multiple subscriptions (#18768)

* upadte message when >1 sub

* Update src/Accounts/Accounts/Models/RMProfileClient.cs

Co-authored-by: Mike F. Robbins <mike.robbins@microsoft.com>

* update warning message

Co-authored-by: Mike F. Robbins <mike.robbins@microsoft.com>

Author: isra-fel

src/Accounts/Accounts/Models/RMProfileClient.cs

@@ -602,8 +602,10 @@ private bool TryGetTenantSubscription(IAccessToken accessToken,
                                     WriteWarningMessage(string.Format(
                                         "TenantId '{0}' contains more than one active subscription. First one will be selected for further use. " +
                                         "To select another subscription, use Set-AzContext. " +
+                                        Environment.NewLine +
                                         "To override which subscription Connect-AzAccount selects by default, " +
-                                        "use `Update-AzConfig -DefaultSubscriptionForLogin <SubscriptionNameOrId>`.",
+                                        "use `Update-AzConfig -DefaultSubscriptionForLogin 00000000-0000-0000-0000-000000000000`. " +
+                                        "Go to https://go.microsoft.com/fwlink/?linkid=2200610 for more information.",
                                         accessToken.TenantId));
                                 }
                                 subscription = subscription ?? subscriptions.First();