add helm flag for dns egress netpol in egress access tutorial (#237)

docs/features/network-mapping-network-policies/tutorials/k8s-egress-access-control-tutorial.mdx

@@ -24,6 +24,7 @@ To deploy Otterize, head over to [Otterize Cloud](https://app.otterize.com/), an
 
 ```bash
 --set intentsOperator.operator.enableEgressNetworkPolicyCreation=true
+--set networkMapper.dnsClientIntentsUpdateEnabled=true
 ```
 
 ## Tutorial