[#10036] (hopefully) final indentation fix

Author: xabbuh

form/form_themes.rst

@@ -29,11 +29,11 @@ do this, create a new template file that will store the new markup:
     {# templates/form/fields.html.twig #}
     {% block form_row %}
     {% spaceless %}
-	<div class="form_row">
-	    {{ form_label(form) }}
-	    {{ form_errors(form) }}
-	    {{ form_widget(form) }}
-	</div>
+        <div class="form_row">
+            {{ form_label(form) }}
+            {{ form_errors(form) }}
+            {{ form_widget(form) }}
+        </div>
     {% endspaceless %}
     {% endblock form_row %}