Jira integration - documentation issue around transitions

Summary

The Jira UI has changed, and the screenshot of how to get the transition id is no longer accurate.

Steps to reproduce

On https://gitlab.com/help/user/project/integrations/jira#configuring-gitlab, there is a link to the following screenshot: https://gitlab.com/help/user/project/integrations/img/jira_workflow_screenshot.png

Jira has a new UI for workflows that looks like this: http://deathbycomputers.co.uk/crapandstuff/jira_new_workflow_ui.png and this, and it doesn't have the Transition ID on it.

Suggested update

It is possible to get the available transition IDs using the Jira API, at a URL like: https://yourcompany.atlassian.net/rest/api/2/issue/ISSUE-123/transitions
Where the issue you select should be in the state you want to transition from. Alternatively, you can see the transition ID in the statusbar when you mouseover the link to update an issue