[ticket/13347] missing acp_forums template events

PHPBB3-13347
[ticket/13347] fix CS

PHPBB3-13347
[ticket/13347] update event docs

PHPBB3-13347
Merge pull request #3150 from omniError/ticket/13347

[ticket/13347] missing acp_forums template events

Conflicts:
	phpBB/docs/events.md
Merge branch 'develop-ascraeus' into develop