Add missing use statement (#9699)

docs/en/reference/events.rst

@@ -79,7 +79,9 @@ array of events it should be subscribed to.
 .. code-block:: php
 
     <?php
-    class TestEventSubscriber implements \Doctrine\Common\EventSubscriber
+    use Doctrine\Common\EventSubscriber;
+
+    class TestEventSubscriber implements EventSubscriber
     {
         public $preFooInvoked = false;
 
@@ -211,7 +213,6 @@ specific to a particular entity class's lifecycle.
     .. code-block:: attribute
 
         <?php
-        
         use Doctrine\DBAL\Types\Types;
         use Doctrine\Persistence\Event\LifecycleEventArgs;
 
@@ -245,7 +246,6 @@ specific to a particular entity class's lifecycle.
     .. code-block:: annotation
 
         <?php
-        
         use Doctrine\Persistence\Event\LifecycleEventArgs;
 
         /**
@@ -504,7 +504,6 @@ result in an infinite loop.
 .. code-block:: php
 
     <?php
-
     use Doctrine\ORM\Event\PreFlushEventArgs;
 
     class PreFlushExampleListener
@@ -590,7 +589,6 @@ This event is not a lifecycle callback.
 .. code-block:: php
 
     <?php
-
     use Doctrine\ORM\Event\PostFlushEventArgs;
 
     class PostFlushExampleListener
@@ -637,6 +635,8 @@ A simple example for this event looks like:
 .. code-block:: php
 
     <?php
+    use Doctrine\ORM\Event\PreUpdateEventArgs;
+
     class NeverAliceOnlyBobListener
     {
         public function preUpdate(PreUpdateEventArgs $eventArgs)
@@ -656,6 +656,8 @@ lifecycle callback when there are expensive validations to call:
 .. code-block:: php
 
     <?php
+    use Doctrine\ORM\Event\PreUpdateEventArgs;
+
     class ValidCreditCardListener
     {
         public function preUpdate(PreUpdateEventArgs $eventArgs)
@@ -807,6 +809,8 @@ An ``Entity Listener`` could be any class, by default it should be a class with
 .. code-block:: php
 
     <?php
+    use Doctrine\ORM\Event\PreUpdateEventArgs;
+
     class UserListener
     {
         public function preUpdate(User $user, PreUpdateEventArgs $event)
@@ -823,6 +827,10 @@ you need to map the listener method using the event type mapping:
     .. code-block:: php
 
         <?php
+        use Doctrine\ORM\Event\LifecycleEventArgs;
+        use Doctrine\ORM\Event\PreUpdateEventArgs;
+        use Doctrine\ORM\Event\PreFlushEventArgs;
+
         class UserListener
         {
             /** @PrePersist */
@@ -907,6 +915,8 @@ Specifying an entity listener instance :
 .. code-block:: php
 
     <?php
+    use Doctrine\ORM\Event\PreUpdateEventArgs;
+
     // User.php
 
     /** @Entity @EntityListeners({"UserListener"}) */
@@ -933,12 +943,14 @@ Specifying an entity listener instance :
     $listener = $container->get('user_listener');
     $em->getConfiguration()->getEntityListenerResolver()->register($listener);
 
-Implementing your own resolver :
+Implementing your own resolver:
 
 .. code-block:: php
 
     <?php
-    class MyEntityListenerResolver extends \Doctrine\ORM\Mapping\DefaultEntityListenerResolver
+    use Doctrine\ORM\Mapping\DefaultEntityListenerResolver;
+
+    class MyEntityListenerResolver extends DefaultEntityListenerResolver
     {
         public function __construct($container)
         {
@@ -972,13 +984,15 @@ This event is not a lifecycle callback.
 .. code-block:: php
 
     <?php
+    use Doctrine\ORM\Event\LoadClassMetadataEventArgs;
+
     $test = new TestEventListener();
     $evm = $em->getEventManager();
     $evm->addEventListener(Doctrine\ORM\Events::loadClassMetadata, $test);
 
     class TestEventListener
     {
-        public function loadClassMetadata(\Doctrine\ORM\Event\LoadClassMetadataEventArgs $eventArgs)
+        public function loadClassMetadata(LoadClassMetadataEventArgs $eventArgs)
         {
             $classMetadata = $eventArgs->getClassMetadata();
             $fieldMapping = array(
@@ -1011,13 +1025,16 @@ instance and class metadata.
 .. code-block:: php
 
     <?php
+    use Doctrine\ORM\Tools\ToolEvents;
+    use Doctrine\ORM\Tools\Event\GenerateSchemaTableEventArgs;
+
     $test = new TestEventListener();
     $evm = $em->getEventManager();
-    $evm->addEventListener(\Doctrine\ORM\Tools\ToolEvents::postGenerateSchemaTable, $test);
+    $evm->addEventListener(ToolEvents::postGenerateSchemaTable, $test);
 
     class TestEventListener
     {
-        public function postGenerateSchemaTable(\Doctrine\ORM\Tools\Event\GenerateSchemaTableEventArgs $eventArgs)
+        public function postGenerateSchemaTable(GenerateSchemaTableEventArgs $eventArgs)
         {
             $classMetadata = $eventArgs->getClassMetadata();
             $schema = $eventArgs->getSchema();
@@ -1035,13 +1052,16 @@ and the EntityManager.
 .. code-block:: php
 
     <?php
+    use Doctrine\ORM\Tools\ToolEvents;
+    use Doctrine\ORM\Tools\Event\GenerateSchemaEventArgs;
+
     $test = new TestEventListener();
     $evm = $em->getEventManager();
-    $evm->addEventListener(\Doctrine\ORM\Tools\ToolEvents::postGenerateSchema, $test);
+    $evm->addEventListener(ToolEvents::postGenerateSchema, $test);
 
     class TestEventListener
     {
-        public function postGenerateSchema(\Doctrine\ORM\Tools\Event\GenerateSchemaEventArgs $eventArgs)
+        public function postGenerateSchema(GenerateSchemaEventArgs $eventArgs)
         {
             $schema = $eventArgs->getSchema();
             $em = $eventArgs->getEntityManager();