finalize: try to catch failed scripts

_pages/en_US/finalizing-setup.txt

@@ -105,6 +105,7 @@ In this section, you will use a script to automate homebrew installation, SD car
 1. Follow the prompts in the script, answering each question that you are asked
   + If you encounter an error, follow the instructions in the error message or consult the [troubleshooting](troubleshooting#finalizing-setup) page
 1. Once the script says "Setup complete!", press (A) to power off the device
+  + If you do NOT see the message "Setup complete!", the script was not successful and you will need to redo this section
 1. Insert your SD card into your computer
 1. Copy the `/gm9/out/` folder to a safe location on your computer
   + This folder contains critical file backups and should be backed up to multiple locations (i.e. cloud storage) if possible