commit 6c2f6c2240fd53545aae093ace347547469d051e
Author: Joel Pittet <joel@pittet.ca>
Date:   Sun May 19 23:16:26 2013 -0700

    doc updates

diff --git a/core/modules/system/system.module b/core/modules/system/system.module
index ea819f3..b3ea764 100644
--- a/core/modules/system/system.module
+++ b/core/modules/system/system.module
@@ -2683,11 +2683,14 @@ function system_preprocess_block(&$variables) {
 }
 
 /**
- * Implements hook_preprocess_HOOK() for system-plugin-ui-form.tpl.php.
+ * Prepares variables for system plugin UI form templates.
  *
- * The $variables array contains the following arguments:
- * - $form
- */
+ * Default template: system-plugin-ui-form.html.twig.
+ *
+ * @param array $variables
+ *   An associative array containing:
+ *   - form: The plugin form elements.
+*/
 function template_preprocess_system_plugin_ui_form(&$variables) {
   drupal_add_css(drupal_get_path('module', 'system') . '/system.plugin.ui.css');
 }
diff --git a/core/modules/system/templates/system-plugin-ui-form.html.twig b/core/modules/system/templates/system-plugin-ui-form.html.twig
index 897f869..415a6bf 100644
--- a/core/modules/system/templates/system-plugin-ui-form.html.twig
+++ b/core/modules/system/templates/system-plugin-ui-form.html.twig
@@ -4,12 +4,12 @@
  * Default theme implementation to configure blocks.
  *
  * Available variables:
- * - form: The form.
- * - form.left: Form elements that appear in the left column.
- * - form.right: Form elements that appear in the right column.
+ * - form: The form elements which contains:
+ *   - left: Form elements that appear in the left column.
+ *   - right: Form elements that appear in the right column.
  *
- * @see template_preprocess_block_library_form()
- * @see theme_block_library_form()
+ * @see template_preprocess()
+ * @see template_preprocess_system_plugin_ui_form()
  *
  * @ingroup themeable
  */
@@ -27,5 +27,5 @@
   </div>
   {% if form -%}
     <div class="bottom-bar">{{ form }}</div>
-  {%- endif %}
+  {%- endif -%}
 </div>