Update topics/game-jam/index.md

Author: brandonrosage

topics/game-jam/index.md

@@ -6,4 +6,4 @@ related: hackathon, ludum-dare, global-game-jam, game-off, js13k
 short_description: A game jam is a hackathon for creating video games.
 wikipedia_url: https://en.wikipedia.org/wiki/Game_jam
 ---
-Game Jams challenge people to create games within a short period of time (usually over a weekend, a week, or a month) and with certain constraints like limited color palettes, file sizes, themes, etc.
+Game Jams challenge people to create games within a short period of time (usually over a weekend, a week, or a month), and with certain constraints like limited color palettes, file sizes, and themes.