[ticket/12411] Expand vars of event: core.search_modify_tpl_ary

PHPBB3-12411
[ticket/12411] Corrected event vars description

PHPBB3-12411
[ticket/12411] Missed on bool var

sloppy

PHPBB3-12411
[ticket/12411] Improved change documentation

PHPBB3-12411
Merge pull request #2315 from PayBas/ticket/12411

[ticket/12411] Expand vars of event: core.search_modify_tpl_ary

* PayBas/ticket/12411:
  [ticket/12411] Improved change documentation
  [ticket/12411] Missed on bool var
  [ticket/12411] Corrected event vars description
  [ticket/12411] Expand vars of event: core.search_modify_tpl_ary