Add docstring examples for Aggregate window functions #132

Job	Run time
build / lint-toml	8s
build / generate-license	2m 11s
build / lint-python	8s
build / lint-rust	1m 55s
build / check-crates-patch	0s
build / ManyLinux x86_64	13m 18s
build / ManyLinux arm64	11m 20s
build / macOS arm64 & Windows (3.10, macos-latest)	9m 23s
build / macOS arm64 & Windows (3.10, windows-latest)	13m 21s
build / Source distribution	0s
build / build-macos-x86_64	0s
build / Build docs	1s
test	0s
build / Merge build artifacts	1s
	51m 46s

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