Update index.md

Fixed wrong repo name.

Author: ademe-del

collections/game-engines/index.md

@@ -34,7 +34,7 @@ items:
  - xenko3d/xenko
  - lance-gg/lance
  - panda3d/panda3d
- - OpenXRay/xray16
+ - OpenXRay/xray-16
 display_name: Game Engines
 created_by: leereilly
 ---