Update online.py for internet-only layer metadata fields

[twilamoon-science]

Edited metadata text for internet-only layers.

Description

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Checklist

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• [ ] The PR description links to issues that it resolves with closes #{issue_number}
• [ ] Config lockfile updated (inv config.export > qgreenland/config/cfg-lock.json)
• [ ] Environment lockfile updated if needed (conda-lock)
• [ ] Version bumped if needed (bumpversion (major|minor|patch|prerelease|build))
• [ ] CHANGELOG.md updated
• [ ] Documentation updated if needed
• [ ] New unit tests if needed