commit 86826fa3cb38d09415d4140c9baa6040a371e948
Author: Jen Lampton <jen@jeneration.com>
Date:   Sat Jun 29 16:50:35 2013 -0700

    remove the preprocess and un needed docs

diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index 64a05e8..7b46693 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -2215,24 +2215,6 @@ function template_preprocess_tablesort_indicator(&$variables) {
 }
 
 /**
- * Prepares variables for mark templates.
- *
- * Default template: mark.html.twig.
- *
- * @param array $variables
- *   An associative array containing:
- *   - status: Number representing the marker type to display. See MARK_NEW,
- *     MARK_UPDATED, MARK_READ.
- */
-function template_preprocess_mark(&$variables) {
-  global $user;
-  $variables['logged_in'] = FALSE;
-  if ($user->uid) {
-    $variables['logged_in'] = TRUE;
-  }
-}
-
-/**
  * Preprocesses variables for theme_item_list().
  *
  * @param array $variables
diff --git a/core/modules/system/templates/mark.html.twig b/core/modules/system/templates/mark.html.twig
index 2a83c5b..2798bb0 100644
--- a/core/modules/system/templates/mark.html.twig
+++ b/core/modules/system/templates/mark.html.twig
@@ -9,9 +9,6 @@
  *   - MARK_NEW
  *   - MARK_UPDATED
  *   - MARK_READ
- * - logged_in: A flag indicating whether the user is logged in or not.
- *
- * @see template_preprocess_mark()
  *
  * @ingroup themeable
  */