Update the jira integration doc.

doc/integration/jira.md

@@ -25,11 +25,14 @@ Go to project settings page and fill in the project name for the JIRA project:
 
 Next, go to the services page and find JIRA.
 
+![Jira services page](jira_service.png)
+
 1. Tick the active check box to enable the service.
 1. Supply the url to JIRA server, for example http://jira.sample
 1. Supply the username of a user we created under `Configuring JIRA` section, for example `gitlab`
 1. Supply the password of the user
-1. Optional: supply the JIRA api version, default is version 2
+1. Optional: supply the JIRA api version, default is version
+1. Optional: supply the JIRA issue transition ID (issue transition to closed). This is dependant on JIRA settings, default is 2
 1. Save
 
 Now we should be able to interact with JIRA issues, for example we can close a JIRA issue by commiting to our GitLab repository and referencing the JIRA issue( in the format of JIRAPROJECT-123).