Codelab typo fix
Codelab typo fix

firebase/FirebaseUI-Android,firebase/FirebaseUI-Android,SUPERCILEX/FirebaseUI-Android,SUPERCILEX/FirebaseUI-Android,samtstern/FirebaseUI-Android,samtstern/FirebaseUI-Android,SUPERCILEX/FirebaseUI-Android,firebase/FirebaseUI-Android,firebase/FirebaseUI-Android,JosefHruska/FirebaseUI-Android,samtstern/FirebaseUI-Android,MaciejCiemiega/FirebaseUI-Android,JosefHruska/FirebaseUI-Android,SUPERCILEX/FirebaseUI-Android