docs: update docs for RegisterPlayerEvent (#73)

src/LuaEngine/GlobalMethods.h

@@ -709,6 +709,7 @@ namespace LuaGlobalFunctions
      *     PLAYER_EVENT_ON_LEARN_SPELL             =     44,       // (event, player, spellId)
      *     PLAYER_EVENT_ON_ACHIEVEMENT_COMPLETE    =     45,       // (event, player, achievement)
      *     PLAYER_EVENT_ON_FFAPVP_CHANGE           =     46,       // (event, player, hasFfaPvp)
+     *     PLAYER_EVENT_ON_UPDATE_AREA             =     47,       // (event, player, oldArea, newArea)
      * };
      * </pre>
      *