[Reference][Twig Form Reference] Revert wrong code block fix

Author: bicpi

reference/forms/twig_reference.rst

@@ -218,7 +218,8 @@ object:
 
     .. code-block:: html+jinja
 
-        <label for="{{ form.name.vars.id }}" class="{{ form.name.vars.required ? 'required' : '' }}">
+        <label for="{{ form.name.vars.id }}"
+            class="{{ form.name.vars.required ? 'required' : '' }}">
             {{ form.name.vars.label }}
         </label>