Update Set-SPOTenantSyncClientRestriction.md

Redo of #6617

Author: chrisda

sharepoint/sharepoint-ps/sharepoint-online/Set-SPOTenantSyncClientRestriction.md

@@ -264,6 +264,9 @@ Accept wildcard characters: False
 Controls whether or not a tenant's users can sync OneDrive for Business libraries with the old OneDrive for Business sync client.
 The valid values are **OptOut, HardOptin, and SoftOptin**.
 
+> [!NOTE]
+> GrooveBlockOptions is planned to be deprecated. Please refrain from using the parameter.
+
 ```yaml
 Type: String
 Parameter Sets: GrooveBlockOptions