Update README

Author: caiozullo

README.md

@@ -97,7 +97,7 @@ We've provided you with appropriate tests to guide and validate your solution. Y
 
 	- Create a Pull Request from your branch to the main challenge repo's matching branch.
 
-		- For example, if you chose the `xcode12_4` branch, your PR should be from your branch into the main repo's `xcode12_4` branch (DO NOT MIX Xcode versions or you'll have merge conflicts!).
+		- For example, if you implemented the challenge using the `xcode12_4` branch, your PR should be from your fork's `xcode12_4` branch into the main repo's `xcode12_4` branch (DO NOT MIX Xcode versions or you'll have merge conflicts!).
 
 	- The title of the Pull Request should be: **Your Name - Feed API Challenge**.