Update geus_mineral_occurrences.py citation

[twilamoon-science]

Small edits to full citation.

Description

Please replace this text with a clear description of the change. Please include closes
keywords to link any related issues that will auto-close when this PR merges.

Checklist

If an item on this list is done or not needed, check it with [x] or click the
checkbox.

• 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 (for user-facing changes)
• Documentation updated if needed
• New unit tests if needed

[trey-stafford]

Just needs the config lockfile updated.