Update create-custom-ip-address-prefix-ipv6-powershell.md

fixed network module
-------
cc: @asudbring

Author: brianlehr

articles/virtual-network/ip-services/create-custom-ip-address-prefix-ipv6-powershell.md

@@ -37,7 +37,7 @@ The steps in this article detail the process to:
 - An Azure account with an active subscription. [Create an account for free](https://azure.microsoft.com/free/?WT.mc_id=A261C142F).
 - Azure PowerShell installed locally or Azure Cloud Shell.
 - Sign in to Azure PowerShell and ensure you've selected the subscription with which you want to use this feature.  For more information, see [Sign in with Azure PowerShell](/powershell/azure/authenticate-azureps).
-- Ensure your Az.Network module is 4.21.0 or later. To verify the installed module, use the command Get-InstalledModule -Name "Az.Network". If the module requires an update, use the command Update-Module -Name "Az.Network" if necessary.
+- Ensure your Az.Network module is 5.1.1 or later. To verify the installed module, use the command Get-InstalledModule -Name "Az.Network". If the module requires an update, use the command Update-Module -Name "Az.Network" if necessary.
 - A customer owned IP range to provision in Azure.
     - A sample customer range (2a05:f500:2::/48) is used for this example. This range won't be validated by Azure. Replace the example range with yours.
 
@@ -131,4 +131,4 @@ It is possible to commission the global custom IPv6 prefix prior to the regional
 
 - To learn about scenarios and benefits of using a custom IP prefix, see [Custom IP address prefix (BYOIP)](custom-ip-address-prefix.md).
 
-- For more information on managing a custom IP prefix, see [Manage a custom IP address prefix (BYOIP)](manage-custom-ip-address-prefix.md).
+- For more information on managing a custom IP prefix, see [Manage a custom IP address prefix (BYOIP)](manage-custom-ip-address-prefix.md).