fix: update the link to the new address.

this change eliminates the need to redirect the page.

doc/security/two_factor_authentication.md

@@ -6,7 +6,7 @@ password to login, they'll be prompted for a code generated by an application on
 their phone.
 
 You can read more about it here:
-[Two-factor Authentication (2FA)](../profile/two_factor_authentication.md)
+[Two-factor Authentication (2FA)](../user/profile/account/two_factor_authentication.md)
 
 ## Enforcing 2FA for all users