clarifying docs for v2.ToPILImage() #975

Job	Run time
linux (linux.12xlarge, cpu) / linux-job	40s
macos (macos-12) / macos-job	1m 21s
macos (macos-m1-12) / macos-job	1m 13s
windows (windows.4xlarge, cpu) / windows-job	2m 57s
windows (windows.g5.4xlarge.nvidia.gpu, cuda, 11.8) / windows-job	1m 34s
linux (linux.g5.4xlarge.nvidia.gpu, cuda, 11.8) / linux-job	1m 5s
	8m 50s

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