I realize it contradicts some of my previous edit summaries, but I realized while reviewing some of the terrain articles for Freeciv that they include a See also section linking directly to the overview pages for the in-game entities they describe. If you want to add this to any articles for Civ5, Civ6, or any other mainstream Civ game, put it after the Trivia, Gallery, and/or Videos section(s) but before the References and External links section(s), and follow the same format I used on the Aircraft Carrier (Civ6) and Cathedral (Civ6) articles. This will give all of the articles a clean, consistent look and allow players to easily access the "hub" articles from which they can read about these entities in other Civ games.
Also, the above applies only when creating a See also section that references articles from other games. When linking to closely-related articles from the same game, you can link directly to them as you did in God of War (Civ6) and Naval unit (Civ6).