diff --git a/core/modules/system/system.admin.inc b/core/modules/system/system.admin.inc
index 9c577d0f98e..5ae24c07fbf 100644
--- a/core/modules/system/system.admin.inc
+++ b/core/modules/system/system.admin.inc
@@ -18,11 +18,10 @@ use Drupal\Core\Url;
  *
  * @param $variables
  *   An associative array containing:
- *   - content: List of administrative menu items. Each menu item contains:
- *     - url: Path to the admin section.
- *     - title: Short name of the section.
- *     - description: Description of the administrative menu item.
- *     - options: URL options. See \Drupal\Core\Url::fromUri() for details.
+ *   - content: An array containing information about the block. Each element
+ *     of the array represents an administrative menu item, and must at least
+ *     contain the keys 'title', 'link_path', and 'localized_options', which are
+ *     passed to l(). A 'description' key may also be provided.
  */
 function template_preprocess_admin_block_content(&$variables) {
   if (!empty($variables['content'])) {
diff --git a/core/modules/system/templates/admin-block-content.html.twig b/core/modules/system/templates/admin-block-content.html.twig
index d1c6695b99c..f1c5f27a4e6 100644
--- a/core/modules/system/templates/admin-block-content.html.twig
+++ b/core/modules/system/templates/admin-block-content.html.twig
@@ -4,12 +4,10 @@
  * Default theme implementation for the content of an administrative block.
  *
  * Available variables:
- * - content: List of administrative menu items. Each menu item contains:
- *   - link: Link to the admin section.
- *   - title: Short name of the section.
- *   - description: Description of the administrative menu item.
- *   - url: URI to the admin section.
- *   - options: URL options. See \Drupal\Core\Url::fromUri() for details.
+ * - content: A list containing information about the block. Each element
+ *   of the array represents an administrative menu item, and must at least
+ *   contain the keys 'title', 'link_path', and 'localized_options', which are
+ *   passed to l(). A 'description' key may also be provided.
  * - attributes: HTML attributes to be added to the element.
  * - compact: Boolean indicating whether compact mode is turned on or not.
  *
diff --git a/core/themes/claro/templates/admin/admin-block-content.html.twig b/core/themes/claro/templates/admin/admin-block-content.html.twig
index d57183e39f5..cc2f419c4f7 100644
--- a/core/themes/claro/templates/admin/admin-block-content.html.twig
+++ b/core/themes/claro/templates/admin/admin-block-content.html.twig
@@ -8,8 +8,6 @@
  *   - link: Link to the admin section.
  *   - title: Short name of the section.
  *   - description: Description of the administrative menu item.
- *   - url: URI to the admin section.
- *   - options: URL options. See \Drupal\Core\Url::fromUri() for details.
  * - attributes: HTML attributes to be added to the element.
  * - compact: Boolean indicating whether compact mode is turned on or not.
  *
diff --git a/core/themes/seven/templates/admin-block-content.html.twig b/core/themes/seven/templates/admin-block-content.html.twig
index ae111e2d353..5991a1b5a6b 100644
--- a/core/themes/seven/templates/admin-block-content.html.twig
+++ b/core/themes/seven/templates/admin-block-content.html.twig
@@ -7,11 +7,9 @@
  *
  * Available variables:
  * - content: List of administrative menu items. Each menu item contains:
- *   - link: Link to the admin section.
+ *   - url: Path to the admin section.
  *   - title: Short name of the section.
  *   - description: Description of the administrative menu item.
- *   - url: URI to the admin section.
- *   - options: URL options. See \Drupal\Core\Url::fromUri() for details.
  * - attributes: HTML attributes to be added to the element.
  * - compact: Boolean indicating whether compact mode is turned on or not.
  *
diff --git a/core/themes/stable/templates/admin/admin-block-content.html.twig b/core/themes/stable/templates/admin/admin-block-content.html.twig
index 536bffbce3e..b59cc85a3ad 100644
--- a/core/themes/stable/templates/admin/admin-block-content.html.twig
+++ b/core/themes/stable/templates/admin/admin-block-content.html.twig
@@ -4,12 +4,10 @@
  * Theme override for the content of an administrative block.
  *
  * Available variables:
- * - content: List of administrative menu items. Each menu item contains:
- *   - link: Link to the admin section.
- *   - title: Short name of the section.
- *   - description: Description of the administrative menu item.
- *   - url: URI to the admin section.
- *   - options: URL options. See \Drupal\Core\Url::fromUri() for details.
+ * - content: A list containing information about the block. Each element
+ *   of the array represents an administrative menu item, and must at least
+ *   contain the keys 'title', 'link_path', and 'localized_options', which are
+ *   passed to l(). A 'description' key may also be provided.
  * - attributes: HTML attributes to be added to the element.
  * - compact: Boolean indicating whether compact mode is turned on or not.
  *
diff --git a/core/themes/stable9/templates/admin/admin-block-content.html.twig b/core/themes/stable9/templates/admin/admin-block-content.html.twig
index 536bffbce3e..b59cc85a3ad 100644
--- a/core/themes/stable9/templates/admin/admin-block-content.html.twig
+++ b/core/themes/stable9/templates/admin/admin-block-content.html.twig
@@ -4,12 +4,10 @@
  * Theme override for the content of an administrative block.
  *
  * Available variables:
- * - content: List of administrative menu items. Each menu item contains:
- *   - link: Link to the admin section.
- *   - title: Short name of the section.
- *   - description: Description of the administrative menu item.
- *   - url: URI to the admin section.
- *   - options: URL options. See \Drupal\Core\Url::fromUri() for details.
+ * - content: A list containing information about the block. Each element
+ *   of the array represents an administrative menu item, and must at least
+ *   contain the keys 'title', 'link_path', and 'localized_options', which are
+ *   passed to l(). A 'description' key may also be provided.
  * - attributes: HTML attributes to be added to the element.
  * - compact: Boolean indicating whether compact mode is turned on or not.
  *