[c10d][Doc] Add a flight recorder tutorial #2873

Job	Run time
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	12m 48s
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	49m 46s
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	16m 52s
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	27m 16s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	17m 55s
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	15m 21s
pytorch_tutorial_build_worker (7, 15, linux.4xlarge.nvidia.gpu)	18m 15s
pytorch_tutorial_build_worker (8, 15, linux.4xlarge.nvidia.gpu)	17m 39s
pytorch_tutorial_build_worker (9, 15, linux.4xlarge.nvidia.gpu)	31m 27s
pytorch_tutorial_build_worker (10, 15, linux.4xlarge.nvidia.gpu)	22m 3s
pytorch_tutorial_build_worker (11, 15, linux.4xlarge.nvidia.gpu)	33m 54s
pytorch_tutorial_build_worker (12, 15, linux.4xlarge.nvidia.gpu)	17m 53s
pytorch_tutorial_build_worker (13, 15, linux.4xlarge.nvidia.gpu)	18m 5s
pytorch_tutorial_build_worker (14, 15, linux.4xlarge.nvidia.gpu)	12m 42s
pytorch_tutorial_build_worker (15, 15, linux.4xlarge.nvidia.gpu)	19m 15s
pytorch_tutorial_build_manager	18m 24s
	5h 49m 35s

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