Fix architecture summary

[vlasebian]

Summary

The architecture summary is not delimited properly.

Screenshots

Before:

After:

Changes

• Added delimiter for architecture summary.

Notes for Reviewers

None.

Checklist

• Scope: The referenced issue is addressed, there are no unrelated changes.
• Run Locally: Verified that the docs build using make server, posted screenshots, verified external links. Test with HUGO_PARAMS_SEARCH_ENABLED=true if style changes will affect the search bar.
• New Features Marked: Documentation for new features is marked using the new-in-version shortcode, according to the guidelines in CONTRIBUTING.
• Style Guidelines: Documentation obeys style guidelines in CONTRIBUTING.
• Commits: Commit messages follow guidelines in CONTRIBUTING, there are no fixup commits left.

[vlasebian]

Closing it, I noticed it was fixed in another PR.