PeriodicTasks.changed() missing 1 required positional argument: 'instance'

[charleswhchan]

The following example in the doc is incorrect: https://django-celery-beat.readthedocs.io/en/stable/#important-warning-about-time-zones

Error:
PeriodicTasks.changed() missing 1 required positional argument: 'instance'

[bbilly1]

Duplicate of this: #919

Currently the docs website is not rebuilding.