Document that datasets support pathlib.Path #2237

Job	Run time
linux (linux.12xlarge, cpu) / linux-job	33s
linux (linux.g5.4xlarge.nvidia.gpu, cuda, 11.8) / linux-job	54s
macos (macos-12) / macos-job	1m 37s
macos (macos-m1-stable) / macos-job	59s
windows (windows.4xlarge, cpu) / windows-job	3m 9s
windows (windows.g5.4xlarge.nvidia.gpu, cuda, 11.8) / windows-job	54s
	8m 6s

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