silence destroy_proces_group() warning

[msaroufim]

All these examples have warnings of the below sort

[rank0]:[W825 13:09:39.967659278 ProcessGroupNCCL.cpp:1538] Warning: WARNING: destroy_process_group() was not called before program exit, which can leak resources. For more info, please see https://pytorch.org/docs/stable/distributed.html#shutdown (function operator())
(create) ➜  tensor_parallelism git:(main) ✗ CUDA_VISIBLE_DEVICES=4,5,6,7 torchrun --nnodes=1 --nproc_per_node=4 tensor_parallel_example.py

I don't think they're "dangerous" since people seem to ignore them just fine so this is just to be nice

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