docs: document JAX backend #9490

Job	Run time
Build source distribution	14s
determine-arm64-runner	1s
Build wheels for cp311-manylinux_x86_64	6m 5s
Build wheels for cp311-manylinux_x86_64	5m 53s
Build wheels for cp311-macosx_x86_64	5m 41s
Build wheels for cp311-macosx_arm64	4m 21s
Build wheels for cp311-win_amd64	6m 6s
Build wheels for cp310-manylinux_aarch64	5m 20s
build_pypi_index	16s
build_docker (12)	2m 3s
build_docker (_cu11, 11)	3m 1s
upload_pypi	0s
deploy_pypi_index	0s
Pass testing build wheels	3s
	39m 4s

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