Update landing_page.md

docs/overview/landing_page.md

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   <img width="90%" src="assets/landingpage.png">
 </p>
 
-The user can log in **_S4L_<sup>_lite_</sup>** platform via this landing page. Once the user enters the email address and password, Two-factor authentication (2FA) is required. An SMS with the required one-time 4-digit pin is sent to the user's mobile phone number or alternatively, the code can be requested via email.
+The user can log in **_S4L_<sup>_lite_</sup>** platform via this landing page. Once the user enters the email address and password, Two-factor authentication (2FA) is required. An SMS with the required one-time 6-digit pin is sent to the user's mobile phone number or alternatively, the code can be requested via email.
 
 Registration is currently available only via an invitation and clicking ```Create Account``` button will show the user the webpage link (https://zmt.swiss/support/support/s4l-lite/) to request access to **_S4L_<sup>_lite_</sup>**.