fix: 🐛 update url for rntl

✅ Closes: #246

Author: MatthysDev

challenges/ecosystem/05.md

@@ -13,7 +13,7 @@ We are writing unit tests to avoid regressions over time. Creating a brand new a
 
 > `RNTL` is a very light-weight solution for testing without all the implementation details. The main utilities it provides involve querying for nodes similarly to how users would find them. In this way, testing-library helps ensure your tests give you confidence in your UI code.
 
-- Check [`RNTL` documentation](https://callstack.github.io/react-native-testing-library/docs/getting-started)
+- Check [`RNTL` documentation](https://callstack.github.io/react-native-testing-library/docs/start/quick-start)
 
 ### How to write your first test