In the link
Under the Jira Server section
In Octopus Deploy Configure the Release Note Options (optional).
Jira username/password: Set these values to allow Octopus to connect to Jira and retrieve Jira issue (work item) details when viewing packages or creating releases. If these are not provided, just the raw work item references will be used as the work item link descriptions. If they are provided the work item’s title will be used as the work item link’s description.
The password should be an API Token, rather than an actual password
Is the bold text above correct as I can not find how to generate an API token on Jira server (can on cloud)