uncomment env

packages/app-builder/.env.example

@@ -29,6 +29,7 @@ MARBLE_APP_URL=http://localhost:3000
 # Configure your Firebase project to allow username and password authentication.
 FIREBASE_PROJECT_ID=
 FIREBASE_API_KEY=
+FIREBASE_AUTH_DOMAIN=
 
 #
 # OPTIONAL SETTINGS
@@ -38,7 +39,6 @@ FIREBASE_API_KEY=
 # To retrieve those value, go into the settings of your Firebase project, and register a new app from the 'General' tab.
 # The two information below will be provided to you after that. 
 # FIREBASE_APP_ID=
-# FIREBASE_AUTH_DOMAIN=
 
 # Uncomment this line if you are using the Firebase emulator for testing.
 # FIREBASE_AUTH_EMULATOR_HOST="localhost:9099"