[18GA] Adds coordinates to private description

[philcampeau]

Fixes #10965

Before clicking "Create"

• Branch is derived from the latest master
• Add the pins or archive_alpha_games label if this change will break existing games
• Code passes linter with docker compose exec rack rubocop -a
• Tests pass cleanly with docker compose exec rack rake

Implementation Notes

Explanation of Change

Adds hex coordinate I9 to the description of the Waycross & Southern private company description.

Screenshots

Any Assumptions / Hacks

[perwestling]

I did not get around to this, but it looked fine.