[PyTorchJob] Example document should be modified

[sakaia]

I am trying to execute kubeflow 1.0.1 with microk8s 1.15. following errors are appeared.

1. label name should be fixed.
   Following command is working. but document is written as pytorch_job_name.

$ kubectl get pods -l pytorch-job-name=pytorch-dist-mnist-gloo

2. Following file does not exist pytorch_job_mnist.yaml
   Of course, it refers distributed example. But it is inconsistent with example.
   Hopefully the file pytorch_job_mnist.yaml is supplied

3. Current Example seems not working
   This is PyTorchJob example issue, NOT document issue.

Ref
Example PytorchJob is not starting #264

The document exsists on follows.
https://github.com/kubeflow/website/blob/master/content/docs/components/training/pytorch.md

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