Fix property type.

src/Database/Statement/StatementDecorator.php

@@ -39,7 +39,7 @@ class StatementDecorator implements StatementInterface, Countable, IteratorAggre
      * Statement instance implementation, such as PDOStatement
      * or any other custom implementation.
      *
-     * @var \Cake\Database\StatementInterface
+     * @var \PDOStatement
      */
     protected $_statement;
 

src/Database/StatementInterface.php

@@ -17,8 +17,6 @@ namespace Cake\Database;
 /**
  * Represents a database statement. Concrete implementations
  * can either use PDOStatement or a native driver
- *
- * @property string $queryString
  */
 interface StatementInterface
 {