Update to Drupal 8.0.0-rc3. For more information, see https://www.drupal.org/node/2608078

core/modules/system/templates/block--system-menu-block.html.twig

@@ -9,8 +9,7 @@
  * - configuration: A list of the block's configuration values.
  *   - label: The configured label for the block.
  *   - label_display: The display settings for the label.
- *   - module: The module that provided this block plugin.
- *   - cache: The cache settings.
+ *   - provider: The module or other provider that provided this block plugin.
  *   - Block plugin specific settings will also be stored here.
  * - content: The content of this block.
  * - attributes: HTML attributes for the containing element.

core/modules/system/templates/container.html.twig

@@ -3,8 +3,10 @@
  * @file
  * Default theme implementation of a container used to wrap child elements.
  *
- * Used for grouped form items. Can also be used as a #theme_wrapper for any
+ * Used for grouped form items. Can also be used as a theme wrapper for any
  * renderable element, to surround it with a <div> and HTML attributes.
+ * See the @link forms_api_reference.html Form API reference @endlink for more
+ * information on the #theme_wrappers render array property.
  *
  * Available variables:
  * - attributes: HTML attributes for the containing element.

core/modules/system/templates/status-report.html.twig

@@ -18,6 +18,7 @@
  */
 #}
 <table class="system-status-report">
+  <tbody>
   {% for requirement in requirements %}
     <tr class="system-status-report__entry system-status-report__entry--{{ requirement.severity_status }} color-{{ requirement.severity_status }}">
       {% if requirement.severity_status in ['warning', 'error'] %}