bad yaml in documentation

[tacman]

cache: aws_s3_resolver
    filter_sets:
        cache: ~
        user_thumbnail:
            cache: aws_s3_resolver
            quality: 75
            filters:

on https://symfony.com/bundles/LiipImagineBundle/current/events.html

This YAML isn't right. I'm not sure what it's supposed to be. I don't use OneUp, I was looking for an example using flysystem that has the cached images stored on s3 instead of locally.