Updated triggerPinOrBiometricAuthentication README description (#235)

Updated `triggerPinOrBiometricAuthentication` message description in
README specifying responses

---------

Co-authored-by: Abel Toledano <[email protected]>

Author: dhidalgofadrique

README.md

@@ -1271,15 +1271,20 @@ triggerPinOrBiometricAuthentication: ({
 
 -   `maxSecondsSinceLastValidation`: if time elapsed since last authentication
     is less than the number of seconds specified here authentication will
-    succeed without requesting it again.
+    succeed without requesting it again, returning
+    `LAST_AUTHENTICATION_STILL_VALID`
 
 <kbd>App version >=25.5</kbd>
 
 If the new PIN & Biometrics 2.0 (device authentication) feature is enabled,
 there are a couple of details to take into account:
 
 -   If the setting is not enabled by the user, the device authentication will be
-    asked and if it goes right, the setting will be enabled.
+    asked and if it goes right, the setting will be enabled and the method will
+    return `USER_ENABLED_AUTHENTICATION`
+-   If the setting is already enabled by the user, the device authentication
+    will be asked and if it goes right, the setting will remain unchanged
+    (enabled) and the method will return `USER_AUTHENTICATED`
 -   If the device doesn't have any authentication configured, the method will
     return `DEVICE_HAS_NO_AUTHENTICATION` as result.