docs: Simplification of the DFtoVW tutorial (#4693) #5964

Job	Run time
manylinux.aarch64.py3.7.build	42m 43s
manylinux.amd64.py3.6.build	4m 11s
manylinux.aarch64.py3.8.build	43m 41s
manylinux.amd64.py3.7.build	4m 7s
manylinux.aarch64.py3.9.build	42m 36s
manylinux.amd64.py3.8.build	4m 14s
ubuntu-latest.amd64.py3.8.sdist-bundle	47s
manylinux.aarch64.py3.10.build	43m 25s
manylinux.amd64.py3.9.build	4m 11s
manylinux.amd64.py3.10.build	4m 8s
macos.amd64.py3.6.build	15m 25s
windows-2019.amd64.py3.6.build	12m 35s
macos.amd64.py3.7.build	10m 23s
windows-2019.amd64.py3.7.build	17m 0s
macos.amd64.py3.8.build	16m 38s
windows-2019.amd64.py3.8.build	16m 52s
macos.amd64.py3.9.build	13m 36s
windows-2019.amd64.py3.9.build	17m 45s
macos.amd64.py3.10.build	13m 46s
windows-2019.amd64.py3.10.build	17m 53s
ubuntu-latest.amd64.py3.8.sdist-build-test	5m 0s
manylinux.amd64.py3.6.test	3m 18s
manylinux.amd64.py3.7.test	3m 12s
manylinux.amd64.py3.8.test	2m 32s
manylinux.amd64.py3.9.test	2m 35s
manylinux.amd64.py3.10.test	2m 33s
macos.amd64.py3.6.test	5m 13s
macos.amd64.py3.7.test	5m 39s
macos.amd64.py3.8.test	14m 3s
macos.amd64.py3.9.test	13m 41s
macos.amd64.py3.10.test	15m 9s
windows-2019.amd64.py3.6.test	7m 54s
windows-2019.amd64.py3.7.test	6m 43s
windows-2019.amd64.py3.8.test	7m 32s
windows-2019.amd64.py3.9.test	6m 43s
windows-2019.amd64.py3.10.test	7m 51s
manylinux.aarch64.py3.7.test	48m 22s
manylinux.aarch64.py3.8.test	51m 14s
manylinux.aarch64.py3.9.test	55m 10s
manylinux.aarch64.py3.10.test	56m 30s
	11h 6m 50s

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