REST API calls to transitions returns 500 error when the transition ID is incorrect

Problem Definition

When making a POST call to the REST transitions API and passing in an incorrect value for the transition ID, the response code passed back is a 500 internal server error. However, this is not documented in the following REST API guide: https://docs.atlassian.com/jira/REST/6.4.12/#d2e5367 with the other response code

Suggested Solution

Add to the response code 500 for incorrect Transition ID in the guide