Add line breaks in auth README (#1262)

Author: SUPERCILEX

auth/README.md

@@ -366,7 +366,9 @@ see the Firebase Auth documentation to
 [get the currently signed-in user](https://firebase.google.com/docs/auth/android/manage-users#get_the_currently_signed-in_user)
 and [register an AuthStateListener](https://firebase.google.com/docs/reference/android/com/google/firebase/auth/FirebaseAuth.html#addAuthStateListener(com.google.firebase.auth.FirebaseAuth.AuthStateListener)).
 
-Note: if you choose to use an `AuthStateListener`, make sure to unregister it before launching the FirebaseUI flow and re-register it after the flow returns. FirebaseUI performs auth operations internally which may trigger the listener before the flow is complete.
+Note: if you choose to use an `AuthStateListener`, make sure to unregister it before launching
+the FirebaseUI flow and re-register it after the flow returns. FirebaseUI performs auth operations
+internally which may trigger the listener before the flow is complete.
 
 #### ID tokens