Update tutorial of device mesh to use fsdp2 (#3472) #4896

Job	Run time
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	14m 55s
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	21m 9s
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	33m 46s
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	37m 46s
pytorch_tutorial_build_worker (11, 15, linux.g5.4xlarge.nvidia.gpu)	13m 59s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	22m 2s
pytorch_tutorial_build_worker (8, 15, linux.g5.4xlarge.nvidia.gpu)	24m 18s
pytorch_tutorial_build_worker (15, 15, linux.g5.4xlarge.nvidia.gpu)	18m 56s
pytorch_tutorial_build_worker (12, 15, linux.g5.4xlarge.nvidia.gpu)	15m 29s
pytorch_tutorial_build_worker (7, 15, linux.g5.4xlarge.nvidia.gpu)	21m 34s
pytorch_tutorial_build_worker (13, 15, linux.g5.4xlarge.nvidia.gpu)	15m 11s
pytorch_tutorial_build_worker (14, 15, linux.g5.4xlarge.nvidia.gpu)	28m 17s
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	25m 51s
pytorch_tutorial_build_worker (10, 15, linux.g5.4xlarge.nvidia.gpu)	16m 37s
pytorch_tutorial_build_worker (9, 15, linux.g5.4xlarge.nvidia.gpu)	18m 57s
pytorch_tutorial_build_manager	21m 39s
	5h 50m 26s

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