docs: deprecated Astro.props.slug → Astro.props.id

[julien-deramond]

Description

While migrating some projects to Astro v5 (+ Starlight), building the website showed warning messages that Astro.props.slug is deprecated (still works right now).

If I'm not wrong, Astro.props.slug can be safely replaced by Astro.props.entry.slug.

This PR applies this change in Starlight documentation in the docs/src/content/docs/guides/overriding-components.mdx override example.

Note: I wasn't sure whether or not I needed to modify also the translated files. Please tell me if I need also to modify the other files.

This PR doesn't contain any changesets as it's a documentation modification only.

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Warnings reference

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[HiDeoo]

Thanks for the PR 🙌

I left a suggestion to the code change but great catch.

I wasn't sure whether or not I needed to modify also the translated files. Please tell me if I need also to modify the other files.

This is perfect, we usually avoid when possible to modify the translated files as updating them could mark them as updated even though they're not.

[HiDeoo]

Amazing, thanks for the quick update 🌟