[TOOLS] Fix errors pointed out by PHPStan level 4

components/Subscription/Subscription.php

@@ -98,7 +98,7 @@ class Subscription extends Component
         $activity     = null;
         if (\is_null($subscription)) {
             DB::persist($subscription = Entity\ActorSubscription::create($opts));
-            $activity                 = Activity::create([
+            $activity = Activity::create([
                 'actor_id'    => $subscriber_id,
                 'verb'        => 'subscribe',
                 'object_type' => Actor::schemaName(),
@@ -184,8 +184,6 @@ class Subscription extends Component
      * @throws DuplicateFoundException
      * @throws NotFoundException
      * @throws ServerException
-     *
-     * @return bool EventHook
      */
     public function onAddProfileActions(Request $request, Actor $object, array &$actions): EventResult
     {