Changes to Terminate a Reader Checkout

added the media type application/problem+json for the response with the status 400

added the media type application/problem+json for the response with the status 401

added the media type application/problem+json for the response with the status 422

added the non-success response with the status 404

removed the non-success response with the status 500

removed the non-success response with the status 502

removed the non-success response with the status 504

added the required property errors/type to the response with the 400 status

added the required property errors/type to the response with the 401 status

added the required property errors/type to the response with the 500 status

added the required property errors/type to the response with the 502 status

added the required property errors/type to the response with the 504 status