Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/themes/seven/templates/admin-block-content.html.twig

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+{#
+/**
+ * @file
+ * Seven's theme implementation for the content of an administrative block.
+ *
+ * Uses unordered list markup in both compact and extended modes.
+ *
+ * Available variables:
+ * - content: List of administrative menu items. Each menu item contains:
+ *   - url: Path to the admin section.
+ *   - title: Short name of the section.
+ *   - description: Description of the administrative menu item.
+ * - attributes: HTML attributes to be added to the element.
+ * - compact: Boolean indicating whether compact mode is turned on or not.
+ *
+ * @see template_preprocess_admin_block_content()
+ * @see seven_preprocess_admin_block_content()
+ */
+#}
+{%
+  set classes = [
+    'admin-list',
+    compact ? 'compact',
+  ]
+%}
+{% if content %}
+  <ul{{ attributes.addClass(classes) }}>
+    {% for item in content %}
+      <li><a href="{{ item.url }}"><span class="label">{{ item.title }}</span><div class="description">{{ item.description }}</div></a></li>
+    {% endfor %}
+  </ul>
+{% endif %}