CONTENT: Module 3 video sync update.

Author: wolstaeb

src/pages/en/tutorials/introduction-tutorials/gametheory.md

@@ -30,7 +30,7 @@ nav:
         url: '/tutorials/introduction-tutorials/introduction/'
 
 ---
-@[youtube](_L5myEydVYc)
+@[youtube](KRJdENvkZLY)
 
 ## Introduction