[Openid-specs-ab] Issue #2112: Syntax error in Trust Mark Request example (openid/connect)

[mbj]

New issue 2112: Syntax error in Trust Mark Request example
https://bitbucket.org/openid/connect/issues/2112/syntax-error-in-trust-mark-request-example

Michael Jones:

`jwtbearer` should be `jwt-bearer`

While we’re touching this section, we should probably also explicitly say that it’s the private\_key\_jwt client authentication method that we’re using.