Changes to Accept terms (signer)

removed the optional property message from the response with the 200 status

removed the optional property status from the response with the 200 status

added Envelope subschema #2 to the response body allOf list for the response status 200

added the non-success response with the status 400

added the non-success response with the status 410

added the optional property allOf[#/components/schemas/ErrorEnvelope]/code to the response with the 401 status

added the optional property allOf[#/components/schemas/ErrorEnvelope]/code to the response with the 500 status

added the optional property allOf[#/components/schemas/ErrorEnvelope]/errors to the response with the 401 status

added the optional property allOf[#/components/schemas/ErrorEnvelope]/errors to the response with the 500 status