Update index.rst

Add a link to our SMS provider, which used Symfony Notifier

Author: DjLeChuck

doc/index.rst

@@ -52,6 +52,7 @@ The bundle supports the following authentication methods out of the box:
 
 * `Webauthn via jbtronics/2fa-webauthn <https://github.com/jbtronics/2fa-webauthn>`_
 * `Text (SMS) messages via erkens/2fa-text <https://github.com/erkens/2fa-text>`_
+* `Text (SMS) messages using Symfony Texter via umanit/2fa-sms <https://github.com/umanit/2fa-sms>`_
 * `More sophisticated code-via-email via danielburger1337/scheb-2fa-email <https://github.com/danielburger1337/scheb-2fa-email>`_
 
 The Authentication Process with Two-Factor Authentication