Add a note to the torchscript tutorials #3215

Job	Run time
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	14m 16s
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	50m 24s
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	18m 51s
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	29m 1s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	20m 3s
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	21m 48s
pytorch_tutorial_build_worker (7, 15, linux.4xlarge.nvidia.gpu)	37m 13s
pytorch_tutorial_build_worker (8, 15, linux.4xlarge.nvidia.gpu)	19m 33s
pytorch_tutorial_build_worker (9, 15, linux.4xlarge.nvidia.gpu)	35m 39s
pytorch_tutorial_build_worker (10, 15, linux.4xlarge.nvidia.gpu)	13m 29s
pytorch_tutorial_build_worker (11, 15, linux.4xlarge.nvidia.gpu)	13m 43s
pytorch_tutorial_build_worker (12, 15, linux.4xlarge.nvidia.gpu)	17m 33s
pytorch_tutorial_build_worker (13, 15, linux.4xlarge.nvidia.gpu)	17m 13s
pytorch_tutorial_build_worker (14, 15, linux.4xlarge.nvidia.gpu)	12m 56s
pytorch_tutorial_build_worker (15, 15, linux.4xlarge.nvidia.gpu)	26m 22s
pytorch_tutorial_build_manager	20m 43s
	6h 8m 47s

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