[ja] minor fix in content/ja/docs/reference/_index.md

[Okabe-Junya]

Change List

• fix "ライブラリー" to "ライブラリ" in content/ja/docs/reference/_index.md

ref. https://kubernetes.io/ja/docs/contribute/localization/#long-vowel

• -ear、-eer、-re、-ty、-dy、-ryで終わる単語は長音を付与しない
  • 例: 「クリア」「エンジニア」「アーキテクチャ」「セキュリティ」「スタディ」「ディレクトリ」

/assign nasa9084

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[Okabe-Junya]

Deploy preview:

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[t-inu]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: a8e5d02f6753a868dc8487e3c1c50d6995f1812b

[inductor]

/approve

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