docs: fix typo "UNet_meatdata" → "UNet_metadata"

[minsuking]

Summary

Fix a minor typo: "UNet_meatdata" → "UNet_metadata".

Why

Correct spelling improves clarity and avoids confusion.

Changes

• Updated spleen_segmentation_3d_visualization_basic.ipynb to use correct key UNet_metadata.

Validation

• Searched repository for meatdata to confirm no other occurrences.

Issue

Fixes tutorials#2015

Notes

• Documentation only, no code logic changes.

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[ericspod]

Looks good to me, thanks for spotting this!

[ericspod]

Hi @minsuking please look at the output from the DCO check to see how to address this with a remediation commit, otherwise we're good to merge.

[minsuking]

Hi @ericspod I’ve added the DCO remediation commit and the DCO check has passed.
All required checks have passed except for the premerge-notebooks build, which failed due to a “No space left on device” error on the GitHub runner (infra-related, not PR-related).

I will update the branch to bring it up to date with main so the checks can rerun.

[ericspod]

Hi @minsuking thanks for the DCO fix, the other CICD issue is an independent issue we're aware of and are in the process of fixing.