Dead link in training-troubleshooting.rst

[jimburtoft]

Doc only change

Added link to a specific version to match

aws-neuron-sdk/frameworks/torch/torch-neuronx/api-reference-guide/training/torch-neuron-envvars.rst

Line 157 in e683286

<https://github.com/pytorch/xla/blob/v1.10.0/TROUBLESHOOTING.md#user-content-environment-variables>`__.

and

aws-neuron-sdk/conf.py

Line 300 in e683286

,r'https://github.com/awslabs/multi-model-server/blob/master/docs/management_api.md',r'https://github.com/aws-neuron/aws-neuron-samples/blob/master/torch-neuronx/training/dp_bert_hf_pretrain/run_dp_bert_large_hf_pretrain_bf16_s128.sh',r' https://github.com/pytorch/xla/blob/master/test/test_train_mp_mnist.py',r'https://github.com/pytorch/xla/blob/v1.10.0/TROUBLESHOOTING.md'

Alternatively, you could update all the links to point to the new location in the master: https://github.com/pytorch/xla/blob/master/docs/source/learn/troubleshoot.md

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