[PR #1893/789a22b6 backport][stable-2.18] Update module default groups documentation #2074
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This is a backport of PR #1893 as merged into devel (789a22b).
Fixes #1759
It looks like default groups / action groups are stable. I think we should update the documentation accordingly, since it still says it's a preview feature.
I've also learned that that there is some magic happening for some special groups for reasons of downwards compatibility or whatever:
https://github.com/ansible/ansible/blob/b5ae8a382baca04442ad82e654ab6e35379844c3/lib/ansible/config/ansible_builtin_runtime.yml#L9685
I think we should document this also.