Fix a typo in metadata sample notebook

[danielsiwiec]

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[kubeflow-bot]

This change is 

[k8s-ci-robot]

Hi @danielsiwiec. 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[Bobgy]

/lgtm
/approve
Thank you for the fix!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Bobgy, danielsiwiec
To complete the pull request process, please assign gaoning777 after the PR has been reviewed.
You can assign the PR to them by writing /assign @gaoning777 in a comment when ready.

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[k8s-ci-robot]

@danielsiwiec: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
kubeflow-metadata-presubmit	8dbe3b2	link	/test kubeflow-metadata-presubmit

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.

[Bobgy]

I'm sorry, this repo is pretty much in an abandoned state. We'll continue to evolve the metadata story, but may not be based on this repo. If presubmit is broken, then we won't accept any new PRs.

[danielsiwiec]

/retest

[k8s-ci-robot]

@danielsiwiec: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.