Update README.md

README.md

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 You can install and run Livebook inside a Hugging Face Space. Here's how you can do it:
 
 1. Duplicate the Livebook Space to your account (by clicking on the [︙] in the top right and choosing "Duplicate this Space")
-2. Create a secret inside your new Space with the name LIVEBOOK_PASSWORD
-3. Set the secret value to a password of your choice with at least 12 characters
+2. Create a secret inside your new Space with the name `LIVEBOOK_PASSWORD` and set the secret value to a password of your choice with at least 12 characters
+3. (Optional) If you plan to use GPU Hardware, also set a secret named `XLA_TARGET` to `cuda118`
 4. Restart the Space
 
 Hugging Face will start Livebook inside your Space. Livebook will show you a login page, and you can use the value you set for the LIVEBOOK_PASSWORD Space secret.