describe-vpn-connection missing information

### Describe the issue

In the doc page I linked, the example json does not have tunnelOptions which looks to me to be a non-optional field that must always be present. It also seems that when updating things like the encryption algorithm, authentication algorithm, and diffie-helman groups the XML does not reflect those changes and is instead static.

Can the documentation be updated to clarify a couple of things
1) Are TunnelOptions always present or can the json sometimes not have them?
1) Is the XML intended to be authoritative or not?

### Links

https://docs.aws.amazon.com/cli/latest/reference/ec2/describe-vpn-connections.html