Add scripting documentation for `WorldMapSector` #2830

Job	Run time
macos (macos-12, Debug, ON)	14m 39s
macos (macos-12, Debug, OFF)	22m 18s
macos (macos-12, RelWithDebInfo, ON)	17m 22s
macos (macos-12, RelWithDebInfo, OFF)	13m 44s
	1h 8m 3s

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