[ja] Update content/ja/docs/concepts/cluster-administration/addons.md

[kfess]

Description

Updated Japanese translation: content/ja/docs/concepts/cluster-administration/addons.md.

Website Link:

• Japanese: https://kubernetes.io/ja/docs/concepts/cluster-administration/addons/
• English: https://kubernetes.io/docs/concepts/cluster-administration/addons/

Issue

Closes: #53132

/area localization
/language ja

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[aoi1]

LGTMです！といっても私には権限がないので他のレビュワーの方向けにコメントを残します。

• 内容としての差分は#計測パートのみであることを確認しました
• #計測パートの修正内容は一行だけで、リンク先にjaがないことを確認しました
• 他の修正内容は。のあとに改行を入れている変更であることを確認しました

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: aoi1
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