Update Add-AzLoadBalancerInboundNatPoolConfig.md (#14231)

with out using the Set-AzLoadBalancer after line 42 the natpool config will not be updated to the LB and the example would be incomplete.

Author: chakra146

src/Network/Network/help/Add-AzLoadBalancerInboundNatPoolConfig.md

@@ -40,6 +40,7 @@ The **Add-AzLoadBalancerInboundNatPoolConfig** cmdlet adds an inbound NAT pool t
 PS C:\> $slb = Get-AzLoadBalancer -Name "MyLoadBalancer" -ResourceGroupName "MyResourceGroup"
 PS C:\> $feIpConfig = Get-AzLoadBalancerFrontendIpConfig -Name "FrontendName" -Loadbalancer $slb
 PS C:\> $slb | Add-AzLoadBalancerInboundNatPoolConfig -Name "myInboundNatPool" -Protocol TCP -FrontendIPConfigurationId $feIpConfig.Id -FrontendPortRangeStart 1001 -FrontendPortRangeEnd 2000 -BackendPort 1001
+PS C:\> $lb | Set-AzLoadBalancer
 ```
 
 ## PARAMETERS