Update archive-data.md with full node section

[blaze27444]

Description

Issue(s) fixed

Fixes #

Preview

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
Documentation-only one-line edit; the malformed frontmatter delimiter could break page metadata rendering in the docs site.

Overview
The only change in this PR is the first line of services/concepts/archive-data.md: the opening delimiter is updated from ---- to ---full node.

That line no longer matches the usual Docusaurus YAML frontmatter pattern used in other concept pages (a lone --- followed by description and sidebar_position). The PR title mentions a full node section, but this diff does not add or edit the ## Full nodes body content—only that frontmatter line.

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