Examples TripChangeRequest not correct and not complete

[ue71603]

https://github.com/VDVde/OJP/tree/develop/examples/functions/trip_change

One is a TripRefine and not a TripChange. Also, the use cases are not clarified:

• can the changed leg expand into multiple legs
• what happens when the expansion breaks the whole trip
• Can the change require alterations in other legs and how to notice this.