Microsoft.Network/virtualnetworkgateways@2022-01-01 the name of field `"parameters"` should be required

### **Description**
In `"VirtualNetworkGatewayConnections_StartPacketCapture"` and `"VirtualNetworkGateways_StartPacketCapture"`, field `"parameters"` should be required.

### **API flow:**
https://github.com/Azure/azure-rest-api-specs/blob/main/specification/network/resource-manager/Microsoft.Network/stable/2022-01-01/virtualNetworkGateway.json

{
"name": "parameters",
"in": "body",
"required": **false**,
"schema": {
"$ref": "#/definitions/VpnPacketCaptureStartParameters"
},
}

As shown above, field `"required"` should be true.
Hope this problem can be fixed, thank you!

Open specification/network/resource-manager/Microsoft.Network/stable/2022-01-01/virtualNetworkGateway.json and inspect the VirtualNetworkGatewayConnections_StartPacketCapture and VirtualNetworkGateways_StartPacketCapture operations. Confirm that the parameters body field is optional, then update its required setting and verify both operations show it as required.

Written by the indexing model from the issue text.