Update Korean translation of suggesting improvements doc

[pratik-mahalle]

Description

Sync the Korean suggesting-improvements guide with the latest English version:

• Align front matter (weight, card anchors) with the upstream page.
• Refresh guidance on opening issues and proposing new content to match current wording.
• Update example phrasing for cross-linking related issues or PRs.

Issue

Closes: <link to related issue, if any>

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