Registration Events sample may occur type error.

It was seen on my work developping "regtist_hubspot" module.
~~~
TypeError: Argument 1 passed to \humhub\modules\regist_hubspot\Events::onUserRegistration() must be an instance of \humhub\modules\regist_hubspot\UserEvent, instance of yii\web\UserEvent given in C:\xampp\htdocs\humhubcom\protected\modules\regist_hubspot\Events.php:29 Stack trace: #0 [internal function]: \humhub\modules\regist_hubspot\Events::onUserRegistration(Object(yii\web\UserEvent)) humhub#1 C:\xampp\htdocs\humhubcom\protected\vendor\yiisoft\yii2\base\Event.php(312): call_user_func(Array, Object(yii\web\UserEvent)) humhub#2 C:\xampp\htdocs\humhubcom\protected\vendor\yiisoft\yii2\base\Component.php(636): yii\base\Event::trigger('humhub\\modules\\...', 'afterRegistrati...', Object(yii\web\UserEvent)) humhub#3 C:\xampp\htdocs\humhubcom\protected\humhub\modules\user\models\forms\Registration.php(282): yii\base\Component->trigger('afterRegistrati...', Object(yii\web\UserEvent)) humhub#4 C:\xampp\htdocs\humhubcom\protected\humhub\modules\user\controllers\RegistrationController.php(73): humhub\modules\user\models\forms\Registration->register(NULL) humhub#5 [internal function]: humhub\modules\user\controllers\RegistrationController->actionIndex() humhub#6 C:\xampp\htdocs\humhubcom\protected\vendor\yiisoft\yii2\base\InlineAction.php(57): call_user_func_array(Array, Array) humhub#7 C:\xampp\htdocs\humhubcom\protected\vendor\yiisoft\yii2\base\Controller.php(157): yii\base\InlineAction->runWithParams(Array) humhub#8 C:\xampp\htdocs\humhubcom\protected\vendor\yiisoft\yii2\base\Module.php(528): yii\base\Controller->runAction('', Array) humhub#9 C:\xampp\htdocs\humhubcom\protected\vendor\yiisoft\yii2\web\Application.php(103): yii\base\Module->runAction('user/registrati...', Array) humhub#10 C:\xampp\htdocs\humhubcom\protected\vendor\yiisoft\yii2\base\Application.php(386): yii\web\Application->handleRequest(Object(humhub\components\Request)) humhub#11 C:\xampp\htdocs\humhubcom\index.php(25): yii\base\Application->run() humhub#12 {main}

docs/develop/modules-event-handler.md

@@ -424,7 +424,7 @@ return [
 
 ```php
 // Event.php
-public static function onUserRegistration(UserEvent $event)
+public static function onUserRegistration($event)
 {
      try {
         $service = new CrmService();
@@ -627,4 +627,4 @@ public static function onSpecialWidgetBeforeRun(WidgetCreateEvent $event)
 Since the widget is created by a call to `Yii::createObject()` the new widget class has to be compatible with the overwritten one,
 which means it has to support all possible properties of the original widget class. This could be achieved by extending the original
 widget.
-:::
+:::