Scripts/SethekkHalls: fixed Talon King Coffer
DB/Misc: Fix typo

By Penguaro, closes #13574
DB/Misc: Fix typo in .titles current helptext

By palimm, closes #13576
DB/Creature: Onyxia's immunities

* Add immunity to interript effects
* Remove immunity to taunt effects as that was only valid for the classic version