[ja] Translate docs/reference/glossary/priority-class.md

[ym1024]

Description

Translate content/en/docs/reference/glossary/priority-class.md into Japanese.

Issue

Closes: #48854

[k8s-ci-robot]

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[ym1024]

Preview Page: https://deploy-preview-49323--kubernetes-io-main-staging.netlify.app/ja/docs/reference/glossary/?all=true#term-priority-class

[b1gb4by]

@ym1024

いくつかコメントしました！確認お願いします。

[ym1024]

@b1gb4by
レビューありがとうございます！コメントいただいた点を修正しましたので、ご確認お願いします。

[b1gb4by]

@ym1024
すいません。僕が指摘した部分で修正が漏れていた部分があったので再度コメントしました 🙇
確認お願いします！！

[ym1024]

@b1gb4by
ありがとうございます。修正しましたので、ご確認お願いします。