Add doc for spin data format #7507

Job	Run time
determine-arm64-runner	1s
Build source distribution	19s
Build wheels for cp311-manylinux_x86_64	5m 46s
Build wheels for cp311-manylinux_x86_64	6m 51s
Build wheels for cp311-macosx_x86_64	5m 27s
Build wheels for cp311-macosx_arm64	3m 8s
Build wheels for cp311-win_amd64	5m 58s
Build wheels for cp310-manylinux_aarch64	5m 48s
build_pypi_index	7s
build_docker (12)	4m 49s
build_docker (_cu11, 11)	3m 28s
upload_pypi	0s
deploy_pypi_index	0s
Pass testing build wheels	3s
	41m 45s

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