Update 0031-kustomize-integration.md

[philoserf]

• fix YAML front matter rendering by quoting the embedded markdown of see-also: as mentioned in a comment to PR update kep/sig-cli/0031-kustomize-integration #680

For reviewers. compare these renderings:

Good: https://github.com/kubernetes/enhancements/blob/1db7af14fadfcb72dbdb51475b116de4eda0ff9d/keps/sig-cli/0031-kustomize-integration.md
Bad: https://github.com/kubernetes/enhancements/blob/e03cd8525b7226359303705c356bf98bdbca2e6d/keps/sig-cli/0031-kustomize-integration.md

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[mattfarina]

Is this the table part this was supposed to fix? The left is the tip of master and the right is the code for the fix. I don't see a difference. Am I missing something?

[philoserf]

Fixed in another PR #664.