[12.x] Add Two-Factor Authentication Docs (#10807)

* Add 2FA docs

* Update starter-kits.md

* formatting

---------

Co-authored-by: Taylor Otwell <[email protected]>

Author: pushpak1300

starter-kits.md

@@ -10,6 +10,7 @@
     - [React](#react-customization)
     - [Vue](#vue-customization)
     - [Livewire](#livewire-customization)
+- [Two-Factor Authentication](#two-factor-authentication)
 - [WorkOS AuthKit Authentication](#workos)
 - [Inertia SSR](#inertia-ssr)
 - [Community Maintained Starter Kits](#community-maintained-starter-kits)
@@ -269,6 +270,20 @@ To change your authentication layout, modify the layout that is used by your app
 </x-layouts.auth.split>
 ```
 
+<a name="two-factor-authentication"></a>
+## Two-Factor Authentication
+
+All starter kits include built-in two-factor authentication (2FA) powered by [Laravel Fortify](/docs/{{version}}/fortify#two-factor-authentication), adding an extra layer of security to user accounts. Users can protect their accounts using any Time-based One-Time Password (TOTP) supporting authenticator application.
+
+Two-factor authentication is enabled by default and supports all options provided by [Fortify](/docs/{{version}}/fortify#two-factor-authentication):
+
+```php
+Features::twoFactorAuthentication([
+    'confirm' => true,
+    'confirmPassword' => true,
+]);
+```
+
 <a name="workos"></a>
 ## WorkOS AuthKit Authentication