Under the Requirements section, it says

• PagerDuty account (you can create a free developer account here)

Under the Usage / Getting Started section, it says

For the integration type, choose "Jenkins CI".

With my free account, searching for this integration yields no results.

After searching the PagerDuty documentation, I found this page which says:

This integration is available with our PagerDuty AIOps add-on. If you would like to sign up for a trial of PagerDuty AIOps features, please read PagerDuty AIOps Trials.

Can the documentation be updated based on the current requirements of PagerDuty?

It's unclear if the article I'm linking here from PagerDuty is specific to change events or all Jenkins integration capability. Personally, I don't need change events, just incident triggers. Hopefully I can still get that with a free account, though I haven't been able to get a hold of PagerDuty support to confirm this.