[ticket/17315] add template events to acp_groups

[danieltj27]

Re-submitting my PR after I made a mistake in the last one #6612.

Checklist:

• Correct branch: master for new features; 3.3.x for fixes
• Tests pass
• Code follows coding guidelines: master and 3.3.x
• Commit follows commit message format

Tracker ticket:

https://tracker.phpbb.com/browse/PHPBB3-17315

[danieltj27]

The testing failed 😭

phpbb_event_md_exporter_test test_crawl_template_file with data set #83 History | < 1 sec

phpbb_event_md_exporter_test::test_crawl_template_file with data set #83 ('adm', 'adm/style/acp_groups.html') LogicException: File 'adm/style/acp_groups.html' contains additional events: 'acp_groups_add_user_form_before', 'acp_groups_add_user_form_during', 'acp_groups_add_user_form_after'  /data/phpBB/phpbb/event/md_exporter.php:640 /data/tests/event/md_exporter_test.php:150 phpvfscomposer:///data/phpBB/vendor/phpunit/phpunit/phpunit:60

[marc1706]

I have slightly adjusted the naming of the proposed events to be more in line with our current events. In addition to that, I have also added the events to events.md. This is what the test failure complained about. :)

edit: I have also modified your commit message to fit our commit message format: https://area51.phpbb.com/docs/dev/3.3.x/development/git.html#commit-messages

[danieltj27]

Thank you for sorting that out. I know for next time 🙂