No toc in "building 2D games", updated to index page

Author: SimonDarksideJ

articles/tutorials/advanced/MobileDeployment/02_crossplatform/index.md

@@ -14,7 +14,7 @@ In this chapter you will:
 
 Before starting this chapter, ensure you have:
 
-- Read the [Building 2D Games](../../../building_2d_games) tutorial
+- Read the [Building 2D Games](../../../building_2d_games/index.md) tutorial
 
 - **For iOS Development:**
   - An App Store Developer Account