Update how-to-managed-network.md

mention rules as service tag rules

Author: joshharrin

articles/machine-learning/how-to-managed-network.md

@@ -707,7 +707,7 @@ ml_client._workspace_outbound_rules.begin_remove(resource_group, ws_name, rule_n
 __Private Endpoints__:
 * When the isolation mode for the managed network is `Allow only approved outbound`, Private Endpoint outbound rules will be automatically created as required rules from the managed network for the workspace and associated resources that have public network access disabled (Key Vault, Storage Account, Container Registry, Azure ML Workspace).
 
-__Outbound__ rules:
+__Outbound__ Service Tag rules:
 
 * `AzureActiveDirectory`
 * `AzureMachineLearning`
@@ -717,7 +717,7 @@ __Outbound__ rules:
 * `MicrosoftContainerRegistry`
 * `AzureMonitor`
 
-__Inbound__ rules:
+__Inbound__ Service Tag rules:
 * `AzureMachineLearning`
 
 ## List of recommended outbound rules