Add intermediate/transformer_building_blocks to index.rst #4452

Job	Run time
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	18m 36s
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	23m 52s
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	40m 39s
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	41m 15s
pytorch_tutorial_build_worker (8, 15, linux.g5.4xlarge.nvidia.gpu)	29m 0s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	25m 8s
pytorch_tutorial_build_worker (9, 15, linux.g5.4xlarge.nvidia.gpu)	18m 53s
pytorch_tutorial_build_worker (11, 15, linux.g5.4xlarge.nvidia.gpu)	17m 7s
pytorch_tutorial_build_worker (10, 15, linux.g5.4xlarge.nvidia.gpu)	17m 58s
pytorch_tutorial_build_worker (7, 15, linux.g5.4xlarge.nvidia.gpu)	20m 33s
pytorch_tutorial_build_worker (14, 15, linux.g5.4xlarge.nvidia.gpu)	27m 27s
pytorch_tutorial_build_worker (12, 15, linux.g5.4xlarge.nvidia.gpu)	21m 52s
pytorch_tutorial_build_worker (13, 15, linux.g5.4xlarge.nvidia.gpu)	31m 25s
pytorch_tutorial_build_worker (15, 15, linux.g5.4xlarge.nvidia.gpu)	32m 43s
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	25m 52s
pytorch_tutorial_build_manager	32m 34s
	7h 4m 54s

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