fix typo in ja/docs init-containers.md

[asny23]

fix typo "retartPolicy" -> "restartPolicy"

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[inductor]

@asny23 こんにちは。コントリビュートありがとうございます！
Linux FoundationのCLA(署名)を登録しないとPRがマージできない仕組みになっているので、Botのガイドに従って対応をお願いします。

不明点があれば、Kubernetes Slackのkubernetes-doc-jaチャンネルまでどうぞ〜

[asny23]

CLA signed!

[inductor]

/lgtm
/approve

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