Chore(doc): merge multitask training doc (#4395) #5

Job	Run time
Build source distribution	12s
determine-arm64-runner	1s
Build wheels for cp311-manylinux_x86_64	6m 3s
Build wheels for cp311-manylinux_x86_64	6m 3s
Build wheels for cp311-macosx_x86_64	5m 28s
Build wheels for cp311-macosx_arm64	2m 42s
Build wheels for cp311-win_amd64	4m 14s
Build wheels for cp310-manylinux_aarch64	29m 59s
build_docker (12)	2m 27s
build_docker (_cu11, 11)	2m 50s
build_pypi_index	12s
upload_pypi	0s
deploy_pypi_index	0s
Pass testing build wheels	2s
	1h 0m 13s

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