docs(firebase_auth): Reword confusing documentation. (#7728)
docs(firebase_auth): Reword confusing documentation. (#7728)


firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire