Update to Drupal 8.1.0. For more information, see https://www.drupal.org/drupal-8.1.0-release-notes

core/themes/stable/templates/admin/block-list.html.twig

@@ -1,21 +0,0 @@
-{#
-/**
- * @file
- * Two column template for the block add/edit form.
- *
- * This template will be used when a block edit form specifies 'block_edit_form'
- * as its #theme callback.  Otherwise, by default, block add/edit forms will be
- * themed by form.html.twig.
- *
- * Available variables:
- * - form: The block add/edit form.
- */
-#}
-<div class="layout-block-list clearfix">
-  <div class="layout-region block-list-primary">
-    {{ form|without('place_blocks') }}
-  </div>
-  <div class="layout-region block-list-secondary">
-    {{ form.place_blocks }}
-  </div>
-</div>

core/themes/stable/templates/admin/help-section.html.twig

@@ -0,0 +1,23 @@
+{#
+/**
+ * @file
+ * Theme override for a section of the help page.
+ *
+ * Available variables:
+ * - title: The section title.
+ * - description: The description text for the section.
+ * - links: Links to display in the section.
+ * - empty: Text to display if there are no links.
+ */
+#}
+<h2>{{ title }}</h2>
+<p>{{ description }}</p>
+{% if links %}
+  <ul>
+  {% for link in links %}
+    <li>{{ link }}</li>
+  {% endfor %}
+  </ul>
+{% else %}
+  <p>{{ empty }}</p>
+{% endif %}