Removing some mentions of cakeError as its been removed. Also adding …

…information about exceptions that can be raised.

cake/libs/controller/controller.php

@@ -491,9 +491,10 @@ protected function __mergeVars() {
  * see Controller::loadModel(); for more info.
  * Loads Components and prepares them for initialization.
  *
- * @return mixed true if models found and instance created, or cakeError if models not found.
+ * @return mixed true if models found and instance created.
  * @see Controller::loadModel()
  * @link http://book.cakephp.org/view/977/Controller-Methods#constructClasses-986
+ * @throws MissingModelException
  */
 	public function constructClasses() {
 		$this->__mergeVars();