Update archive-data.md with full node information

[blaze27444]

Description

Issue(s) fixed

Fixes #

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Checklist

• If this PR updates or adds documentation content that changes or adds technical meaning, it has received an approval from an engineer or DevRel from the relevant team.
• If this PR updates or adds documentation content, it has received an approval from a technical writer.

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• I've read the contribution guidelines.
• I've created a new issue (or assigned myself to an existing issue) describing what this PR addresses.

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Note

Low Risk
Single-line docs frontmatter change; low product risk but may break site build or page metadata if merged as-is.

Overview
The only change in this PR is to the YAML frontmatter on archive-data.md: the opening delimiter is changed from --- to ---full node.

That diverges from other concept pages (e.g. bundler.md, gas.md), which use a plain --- block for description and sidebar_position. A malformed opener can break Docusaurus frontmatter parsing even though the Full nodes / Archive nodes body content is unchanged in the diff.

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