Update Set-AzVirtualNetwork.md (#13857)

* Update Set-AzVirtualNetwork.md

Updated comment for Example 1

* Update Set-AzVirtualNetwork.md

- specify language of code block
- indentation

Co-authored-by: Yeming Liu <[email protected]>

Author: jhaprakash26

src/Network/Network/help/Set-AzVirtualNetwork.md

@@ -24,13 +24,13 @@ The **Set-AzVirtualNetwork** cmdlet updates a virtual network.
 ## EXAMPLES
 
 ### 1: Creates a virtual network and removes one of its subnets
-```
-New-AzResourceGroup -Name TestResourceGroup -Location centralus
-    $frontendSubnet = New-AzVirtualNetworkSubnetConfig -Name frontendSubnet -AddressPrefix "10.0.1.0/24" ## Create resource group
+```powershell
+New-AzResourceGroup -Name TestResourceGroup -Location centralus ## Create resource group 
+$frontendSubnet = New-AzVirtualNetworkSubnetConfig -Name frontendSubnet -AddressPrefix "10.0.1.0/24" ## Create frontend subnet 
 $backendSubnet = New-AzVirtualNetworkSubnetConfig -Name backendSubnet -AddressPrefix "10.0.2.0/24" ## Create backend subnet
 
-$virtualNetwork = New-AzVirtualNetwork -Name MyVirtualNetwork -ResourceGroupName 
-    TestResourceGroup -Location centralus -AddressPrefix "10.0.0.0/16" -Subnet $frontendSubnet,$backendSubnet ## Create virtual network
+$virtualNetwork = New-AzVirtualNetwork -Name MyVirtualNetwork -ResourceGroupName TestResourceGroup `
+    -Location centralus -AddressPrefix "10.0.0.0/16" -Subnet $frontendSubnet,$backendSubnet ## Create virtual network
 
 Remove-AzVirtualNetworkSubnetConfig -Name backendSubnet -VirtualNetwork $virtualNetwork ## Remove subnet from in memory representation of virtual network