adding missing Name flag - line 29 (#25835)

Author: duongau

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

@@ -26,7 +26,7 @@ The **Set-AzPrivateLinkService** cmdlet updates a private link service.
 ```powershell
 $vnet = Get-AzVirtualNetwork -ResourceName "myvnet" -ResourceGroupName "myresourcegroup"
 $IPConfig = New-AzPrivateLinkServiceIpConfig -Name "IP-Config" -Subnet $vnet.subnets[1] -PrivateIpAddress "10.0.0.5"
-$publicip = Get-AzPublicIpAddress -ResourceGroupName "myresourcegroup"
+$publicip = Get-AzPublicIpAddress -Name "myPublicIp1" -ResourceGroupName "myresourcegroup"
 $frontend = New-AzLoadBalancerFrontendIpConfig -Name "FrontendIpConfig01" -PublicIpAddress $publicip
 $lb = New-AzLoadBalancer -Name "MyLoadBalancer" -ResourceGroupName "myresourcegroup" -Location "West US" -FrontendIpConfiguration $frontend  
 $privateLinkService = New-AzPrivateLinkService -ServiceName "mypls" -ResourceGroupName myresourcegroup -Location "West US" -LoadBalancerFrontendIpConfiguration $frontend -IpConfiguration $IPConfig