diff --git a/core/lib/Drupal/Core/Menu/MenuLinkInterface.php b/core/lib/Drupal/Core/Menu/MenuLinkInterface.php
index a0f500c..2141b45 100644
--- a/core/lib/Drupal/Core/Menu/MenuLinkInterface.php
+++ b/core/lib/Drupal/Core/Menu/MenuLinkInterface.php
@@ -11,7 +11,7 @@
 use Drupal\Component\Plugin\DerivativeInspectionInterface;
 
 /**
- * Interface for classes providing a type of menu link.
+ * Defines an interface for classes providing a type of menu link.
  */
 interface MenuLinkInterface extends PluginInspectionInterface, DerivativeInspectionInterface {
 
@@ -213,7 +213,8 @@ public function getDeleteRoute();
    * visible from the edit form.
    *
    * @return array|null
-   *   An array with keys route_name and route_parameters, or NULL.
+   *   An array with keys route_name and route_parameters, or NULL if there is
+   *   no route.
    */
   public function getEditRoute();
 
diff --git a/core/lib/Drupal/Core/Menu/MenuLinkManagerInterface.php b/core/lib/Drupal/Core/Menu/MenuLinkManagerInterface.php
index c213fda..ec9fed6 100644
--- a/core/lib/Drupal/Core/Menu/MenuLinkManagerInterface.php
+++ b/core/lib/Drupal/Core/Menu/MenuLinkManagerInterface.php
@@ -10,7 +10,7 @@
 use Drupal\Component\Plugin\PluginManagerInterface;
 
 /**
- * Defines an interface for storing menu link definitions and creating menu links.
+ * Defines an interface for creating menu links and storing their definitions.
  */
 interface MenuLinkManagerInterface extends PluginManagerInterface {
 
@@ -55,7 +55,7 @@ public function deleteLink($id, $persist = TRUE);
    * @param string $route_name
    *   The route name.
    * @param array $route_parameters
-   *   (optional) The route parameters, defaults to an empty array.
+   *   (optional) The route parameters. Defaults to an empty array.
    * @param string $menu_name
    *   (optional) Restricts the found links to just those in the named menu.
    *
@@ -123,7 +123,7 @@ public function resetLink($id);
    * Counts the total number of menu links.
    *
    * @param string $menu_name
-   *   (optional) The menu name to count by, defaults to all menus.
+   *   (optional) The menu name to count by. Defaults to all menus.
    *
    * @return int
    *   The number of menu links in the named menu, or in all menus if the
diff --git a/core/lib/Drupal/Core/Menu/MenuTreeParameters.php b/core/lib/Drupal/Core/Menu/MenuTreeParameters.php
index d6b6eaa..98d4e87 100644
--- a/core/lib/Drupal/Core/Menu/MenuTreeParameters.php
+++ b/core/lib/Drupal/Core/Menu/MenuTreeParameters.php
@@ -166,7 +166,7 @@ public function setActiveTrail(array $active_trail) {
    *   is a scalar. For more complex options, it is an array. The meaning of
    *   each element in the array is dependent on the $operator.
    * @param string|NULL $operator
-   *   (Optional) The comparison operator, such as =, <, or >=. It also accepts
+   *   (optional) The comparison operator, such as =, <, or >=. It also accepts
    *   more complex options such as IN, LIKE, or BETWEEN. If NULL, defaults to
    *   the = operator.
    *
diff --git a/core/lib/Drupal/Core/Menu/MenuTreeStorage.php b/core/lib/Drupal/Core/Menu/MenuTreeStorage.php
index 43b65c0..d6b20f9 100644
--- a/core/lib/Drupal/Core/Menu/MenuTreeStorage.php
+++ b/core/lib/Drupal/Core/Menu/MenuTreeStorage.php
@@ -1068,7 +1068,7 @@ protected function doBuildTreeData(array $links, array $parents = array(), $dept
    *   A flat array of menu links that are part of the menu. Each array element
    *   is an associative array of information about the menu link, containing
    *   the fields from the $this->table. This array must be ordered
-   *   depth-first.
+   *   depth-first. MenuTreeStorage::loadTreeData() includes a sample query.
    *
    * @param array $parents
    *   An array of the menu link ID values that are in the path from the current
@@ -1079,7 +1079,7 @@ protected function doBuildTreeData(array $links, array $parents = array(), $dept
    * @return array
    *   The fully built tree.
    *
-   * @see MenuTreeStorage::loadTreeData() for a sample query.
+   * @see \Drupal\Core\Menu\MenuTreeStorage::loadTreeData()
    */
   protected function treeDataRecursive(array &$links, array $parents, $depth) {
     $tree = array();
@@ -1141,7 +1141,7 @@ protected function ensureTableExists() {
   }
 
   /**
-   * Determines serialized fields.
+   * Determines serialized fields in the storage.
    *
    * @return array
    *   A list of fields that are serialized in the database.
diff --git a/core/lib/Drupal/Core/Menu/MenuTreeStorageInterface.php b/core/lib/Drupal/Core/Menu/MenuTreeStorageInterface.php
index 1326d8b..f937ddc 100644
--- a/core/lib/Drupal/Core/Menu/MenuTreeStorageInterface.php
+++ b/core/lib/Drupal/Core/Menu/MenuTreeStorageInterface.php
@@ -74,7 +74,7 @@ public function loadByProperties(array $properties);
    * @param string $route_name
    *   The route name.
    * @param array $route_parameters
-   *   (optional) The route parameters, defaults to an empty array.
+   *   (optional) The route parameters. Defaults to an empty array.
    * @param string $menu_name
    *   (optional) Restricts the found links to just those in the named menu.
    *
@@ -242,7 +242,7 @@ public function getMenuNames();
    * Counts the total number of menu links in one menu or all menus.
    *
    * @param string $menu_name
-   *   (optional) The menu name to count by, defaults to all menus.
+   *   (optional) The menu name to count by. Defaults to all menus.
    *
    * @return int
    *   The number of menu links in the named menu, or in all menus if the