docs: fix typos, formatting, and broken links

[morinokami]

🎯 Changes

• Fix missing EventClient reference in configuration.md
• Fix "devtool devtools" typo in overview.md
• Add name property documentation for plugins
• Improve code block formatting consistency
• Fix example links in custom-plugins guides (custom-plugin → custom-devtools)

✅ Checklist

• I have followed the steps in the Contributing guide.
• I have tested this code locally with pnpm test:pr.

🚀 Release Impact

• This change affects published code, and I have generated a changeset.
• This change is docs/CI/dev-only (no release).

[changeset-bot]

⚠️ No Changeset found

Latest commit: a809bf3

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[AlemTuzlak]

thank you so much