updated core to 7.56, secutity update

includes/database/query.inc

@@ -845,8 +845,8 @@ class DeleteQuery extends Query implements QueryConditionInterface {
   /**
    * Executes the DELETE query.
    *
-   * @return
-   *   The return value is dependent on the database connection.
+   * @return int
+   *   The number of rows affected by the delete query.
    */
   public function execute() {
     $values = array();
@@ -1242,7 +1242,7 @@ class UpdateQuery extends Query implements QueryConditionInterface {
  * MergeQuery::updateFields() and MergeQuery::insertFields() needs to be called
  * instead. MergeQuery::fields() can also be called which calls both of these
  * methods as the common case is to use the same column-value pairs for both
- * INSERT and UPDATE. However, this is not mandatory. Another convinient
+ * INSERT and UPDATE. However, this is not mandatory. Another convenient
  * wrapper is MergeQuery::key() which adds the same column-value pairs to the
  * condition and the INSERT query part.
  *