i18n(ja): Update sidebar.mdx

[morinokami]

Description

• Update ja/guides/sidebar.mdx.
• diff
  • Add support for custom HTML attributes to sidebar links #774
  • Support component customisation #709
  • docs: refactor sidebar label translations examples to use tags with regional subtags #881
  • feat: extend badge to be available for group links #995
  • Add more EC text markers and frames to Starlight docs #1102

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Latest commit: 98c057a

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Name	Status	Preview	Updated (UTC)
starlight	✅ Ready (Inspect)	Visit Preview	Dec 2, 2023 10:55pm

[HiDeoo]

Thanks for updating the translation 🙌

As a non-native speaker, I reviewed this PR using the Docs Translation Review Checklist and everything looks perfect to me 👍