It's another one of the help file's mistakes. You can easily confirm this by trying
and get
uninitialized constant RPG::BattleEventPage
If you then try to do
You'll see
@pages=[#<RPG::Troop::Page ... >]
The text in the RPG::Troop documentation in the help file is correct.
Quotepages
Battle events. An RPG::Troop::Page array.
Though I never really realized this until just now and saw that XPA has this incorrect class definition in its scripts.