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Also adds examples.
Summary
SUMMARY: Bugfixes "Fixes documentation of 'duration' feature in NPCs.md"
Purpose of change
The issue caused in #27699 is related to a mistake I made on a lot of my earlier NPCs, where I added durations as described in the documentation, which was incorrect.
Describe the solution
Clarified in documentation that duration is not optional, and that the only permitted string is "PERMANENT", other durations passed are integers.
Also added examples, because examples are good.