Update vnet-flow-logs-powershell.md

Added -FormatVersion 2 parameter/value in sample PS code per discussions from ICM

Ref: https://portal.microsofticm.com/imp/v5/incidents/details/562055059/summary

Author: cogran

articles/network-watcher/vnet-flow-logs-powershell.md

@@ -52,7 +52,7 @@ $vnet = Get-AzVirtualNetwork -Name myVNet -ResourceGroupName myResourceGroup
 $storageAccount = Get-AzStorageAccount -Name myStorageAccount -ResourceGroupName myResourceGroup
 
 # Create a VNet flow log.
-New-AzNetworkWatcherFlowLog -Enabled $true -Name myVNetFlowLog -NetworkWatcherName NetworkWatcher_eastus -ResourceGroupName NetworkWatcherRG -StorageId $storageAccount.Id -TargetResourceId $vnet.Id
+New-AzNetworkWatcherFlowLog -Enabled $true -Name myVNetFlowLog -NetworkWatcherName NetworkWatcher_eastus -ResourceGroupName NetworkWatcherRG -StorageId $storageAccount.Id -TargetResourceId $vnet.Id -FormatVersion 2
 ```
 
 ## Enable virtual network flow logs and traffic analytics
@@ -69,7 +69,7 @@ $storageAccount = Get-AzStorageAccount -Name myStorageAccount -ResourceGroupName
 $workspace = New-AzOperationalInsightsWorkspace -Name myWorkspace -ResourceGroupName myResourceGroup -Location EastUS
 
 # Create a VNet flow log.
-New-AzNetworkWatcherFlowLog -Enabled $true -Name myVNetFlowLog -NetworkWatcherName NetworkWatcher_eastus -ResourceGroupName NetworkWatcherRG -StorageId $storageAccount.Id -TargetResourceId $vnet.Id -EnableTrafficAnalytics -TrafficAnalyticsWorkspaceId $workspace.ResourceId -TrafficAnalyticsInterval 10
+New-AzNetworkWatcherFlowLog -Enabled $true -Name myVNetFlowLog -NetworkWatcherName NetworkWatcher_eastus -ResourceGroupName NetworkWatcherRG -StorageId $storageAccount.Id -TargetResourceId $vnet.Id -FormatVersion 2 -EnableTrafficAnalytics -TrafficAnalyticsWorkspaceId $workspace.ResourceId -TrafficAnalyticsInterval 10
 ```
 
 ## List all flow logs in a region