ml_engine component READMEs incorrect

[TheMichaelHu]

The output sections of the deploy and batch_prediction component's READMEs are
incorrect. Updated to reflect the actual outputs.

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This change is 

[k8s-ci-robot]

Hi @TheMichaelHu. 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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[TheMichaelHu]

/assign @numerology

[numerology]

/ok-to-test

[numerology]

Thanks @TheMichaelHu !

[numerology]

/retest
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: numerology

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[TheMichaelHu]

/retest