Change default value to None

Author: andreimaneev

skype/skype-ps/skype/Set-CsTenantFederationConfiguration.md

@@ -280,7 +280,7 @@ Applicable: Skype for Business Online
 
 Required: False
 Position: Named
-Default value: False
+Default value: None
 Accept pipeline input: False
 Accept wildcard characters: False
 ```