Revert "phpdoc fixes in Zend\Mvc, some cleanup"

This reverts commit dbf4614a7da1a4667fc30098207561c6d8bb236a.

src/EventManagerInterface.php

@@ -84,7 +84,7 @@ public function attach($event, $callback = null, $priority = 1);
      * Detach an event listener
      * 
      * @param  CallbackHandler|ListenerAggregateInterface $listener 
-     * @return bool
+     * @return void
      */
     public function detach($listener);