Improve documentation in StaticConfigTrait

src/Core/StaticConfigTrait.php

@@ -24,6 +24,8 @@ use LogicException;
  * configuration data registered and manipulated.
  *
  * Implementing objects are expected to declare a static `$_dsnClassMap` property.
+ *
+ * @property \Cake\Core\ObjectRegistry $_registry
  */
 trait StaticConfigTrait
 {