Update reference/forms/types/password.rst

Co-authored-by: Oskar Stark <[email protected]>

Author: Seb33300

reference/forms/types/password.rst

@@ -48,7 +48,7 @@ Data passed to the form must be a ``PasswordAuthenticatedUserInterface`` object.
 .. caution::
 
     To minimize the risk of leaking the plain password,
-    this option can only be used with the ``mapped`` option set to ``false``.
+    this option can only be used with the ``mapped`` option set to ``false``::
 
         $builder->add('plainPassword', PasswordType::class, [
             'hash_property_path' => 'password',