configuration example lacks which header to use

[KlausThornProgrammfabrik]

The configuration example https://trac-hacks.org/wiki/SubticketsPlugin#Configuration lacks the section header [subtickets] .

Please add it.

The text "This plugin shares some of the configurations with ChildTicketsPlugin" even seems to suggests that the correct header is [childtickets], so an explicit example would also avoid that misunderstanding.