Swagger: Allowing for VMSS reference during VM creation (#6836)

* Swagger: Allowing for VMSS reference during VM creation

* fixing typo

specification/compute/resource-manager/Microsoft.Compute/stable/2019-03-01/compute.json

@@ -7278,7 +7278,11 @@
         },
         "availabilitySet": {
           "$ref": "#/definitions/SubResource",
-          "description": "Specifies information about the availability set that the virtual machine should be assigned to. Virtual machines specified in the same availability set are allocated to different nodes to maximize availability. For more information about availability sets, see [Manage the availability of virtual machines](https://docs.microsoft.com/azure/virtual-machines/virtual-machines-windows-manage-availability?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json). <br><br> For more information on Azure planned maintenance, see [Planned maintenance for virtual machines in Azure](https://docs.microsoft.com/azure/virtual-machines/virtual-machines-windows-planned-maintenance?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json) <br><br> Currently, a VM can only be added to availability set at creation time. An existing VM cannot be added to an availability set."
+          "description": "Specifies information about the availability set that the virtual machine should be assigned to. Virtual machines specified in the same availability set are allocated to different nodes to maximize availability. For more information about availability sets, see [Manage the availability of virtual machines](https://docs.microsoft.com/azure/virtual-machines/virtual-machines-windows-manage-availability?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json). <br><br> For more information on Azure planned maintenance, see [Planned maintenance for virtual machines in Azure](https://docs.microsoft.com/azure/virtual-machines/virtual-machines-windows-planned-maintenance?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json) <br><br> Currently, a VM can only be added to availability set at creation time. An existing VM cannot be added to an availability set. <br><br>This property cannot exist along with a non-null properties.virtualMachineScaleSet reference."
+        },
+        "virtualMachineScaleSet": {
+          "$ref": "#/definitions/SubResource",
+          "description": "Specifies information about the virtual machine scale set that the virtual machine should be assigned to. Virtual machines specified in the same virtual machine scale set are allocated to different nodes to maximize availability. Currently, a VM can only be added to virtual machine scale set at creation time. An existing VM cannot be added to a virtual machine scale set. <br><br>This property cannot exist along with a non-null properties.availabilitySet reference. <br><br>Minimum api‐version: 2019‐03‐01"
         },
         "proximityPlacementGroup": {
           "$ref": "#/definitions/SubResource",