Fixing some basic typos in README

[ddutta]

typos, tenses, and some cleanup

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[k8s-ci-robot]

Hi @ddutta. Thanks for your PR.

I'm waiting for a kubeflow member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[ddutta]

/assign @YujiOshima

[googlebot]

CLAs look good, thanks!

[gaocegege]

s/mxnet/MXNet
s/pytorch/PyTorch

[ddutta]

good point ... I was just cleaning basic typos ... will do it

[gaocegege]

Thanks 😄

[gaocegege]

/lgtm

Thanks for your contribution!

[k8s-ci-robot]

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