Improve wocky_{decode,compose}_jid documentation
Improve wocky_{decode,compose}_jid documentation

These days, JIDs are defined in RFC 6122.

freedesktop-unofficial-mirror/wocky,noonien-d/wocky,noonien-d/wocky,freedesktop-unofficial-mirror/wocky,freedesktop-unofficial-mirror/wocky,noonien-d/wocky