breaking change message for New-AzVmss (#20935)

* breaking change message

* changelog

---------

Co-authored-by: Theodore Chang <[email protected]>
Co-authored-by: Beisi Zhou <[email protected]>

Author: 3 people

src/Compute/Compute/ChangeLog.md

@@ -20,6 +20,7 @@
 
 -->
 ## Upcoming Release
+* Added breaking change message for `New-AzVmss`.
 * Added `-PerformancePlus` parameter to `New-AzDiskConfig`
 
 ## Version 5.4.0

src/Compute/Compute/Generated/VirtualMachineScaleSet/VirtualMachineScaleSetCreateOrUpdateMethod.cs

@@ -37,7 +37,9 @@
 
 namespace Microsoft.Azure.Commands.Compute.Automation
 {
-    [GenericBreakingChange("Starting in May 2023 the \"New-AzVmss\" cmdlet will deploy with the Trusted Launch configuration by default. To know more about Trusted Launch, please visit https://docs.microsoft.com/en-us/azure/virtual-machines/trusted-launch")]
+    [GenericBreakingChange("Starting May 2023, the \"New-AzVmss\" cmdlet will deploy with the Trusted Launch configuration by default. To know more about Trusted Launch, please visit https://docs.microsoft.com/en-us/azure/virtual-machines/trusted-launch", "6.0.0")]
+    [GenericBreakingChange("Starting May 2023, the \"New-AzVmss\" cmdlet will create a OrchestrationMode: Flexible VMSS by default unless explicitly provded \"-OrchestrationMode Uniform\".", "6.0.0")]
+    [GenericBreakingChange("Starting May 2023, the \"New-AzVmss\" used with \"-OrchestrationMode Flexible\" will allow NAT pool to be configured. Before, VMSS in OrchestrationMode:Flexible defaulted NAT pool to be not configured(null).", "6.0.0")]
     [Cmdlet(VerbsCommon.New, ResourceManager.Common.AzureRMConstants.AzureRMPrefix + "Vmss", DefaultParameterSetName = "DefaultParameter", SupportsShouldProcess = true)]
     [OutputType(typeof(PSVirtualMachineScaleSet))]
     public partial class NewAzureRmVmss : ComputeAutomationBaseCmdlet