app-server README turn/start example uses invalid approvalPolicy value

What happened?

The app-server README's turn/start example uses:

"approvalPolicy": "unlessTrusted"

The current TurnStartParams schema accepts the string values:

• untrusted
• on-failure
• on-request
• never

or a granular approval-policy object. unlessTrusted does not appear to be a valid value.

Expected behavior

The README example should use a valid approvalPolicy value such as on-request, untrusted, on-failure, or never, or show the current granular object form.

Additional context

I searched open issues and PRs for terms including app-server README, approvalPolicy, unlessTrusted, and TurnStartParams, and did not find an existing open item that appears to cover this invalid example value.