docs: document more for multiprocessing #9056

Job	Run time
determine-arm64-runner	1s
Build source distribution	13s
Build wheels for cp311-manylinux_x86_64	5m 42s
Build wheels for cp311-manylinux_x86_64	5m 42s
Build wheels for cp311-macosx_x86_64	5m 50s
Build wheels for cp311-macosx_arm64	3m 19s
Build wheels for cp311-win_amd64	6m 25s
Build wheels for cp310-manylinux_aarch64	5m 12s
build_pypi_index	8s
build_docker (12)	2m 15s
build_docker (_cu11, 11)	2m 57s
upload_pypi	0s
deploy_pypi_index	0s
Pass testing build wheels	4s
	37m 48s

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