Add a note to the torchscript tutorials (#3115) #3216

Job	Run time
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	15m 38s
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	50m 18s
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	18m 56s
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	28m 58s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	19m 31s
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	21m 4s
pytorch_tutorial_build_worker (7, 15, linux.4xlarge.nvidia.gpu)	34m 40s
pytorch_tutorial_build_worker (8, 15, linux.4xlarge.nvidia.gpu)	19m 42s
pytorch_tutorial_build_worker (9, 15, linux.4xlarge.nvidia.gpu)	35m 13s
pytorch_tutorial_build_worker (10, 15, linux.4xlarge.nvidia.gpu)	13m 50s
pytorch_tutorial_build_worker (11, 15, linux.4xlarge.nvidia.gpu)	13m 10s
pytorch_tutorial_build_worker (12, 15, linux.4xlarge.nvidia.gpu)	18m 6s
pytorch_tutorial_build_worker (13, 15, linux.4xlarge.nvidia.gpu)	17m 48s
pytorch_tutorial_build_worker (14, 15, linux.4xlarge.nvidia.gpu)	13m 37s
pytorch_tutorial_build_worker (15, 15, linux.4xlarge.nvidia.gpu)	26m 49s
pytorch_tutorial_build_manager	19m 31s
	6h 6m 51s

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