Update first broken link

Author: mchisolm0

challenges/react-navigation/02.md

@@ -6,7 +6,7 @@
 
 ## 👾 Before we start the exercise
 
-- Check the [`route` prop documentation](https://reactnavigation.org/docs/route-prop).
+- Check the [`route` prop documentation](https://reactnavigation.org/docs/params/).
 - Do you remember how to [pass to the destination route](https://reactnavigation.org/docs/navigation-prop#common-api-reference)?
 
 ## 👨‍🚀 Exercise 2