Minor - fix php doc + fix function call

src/CoreBundle/Entity/Message.php

@@ -314,7 +314,7 @@ class Message
     /**
      * Get attachments.
      *
-     * @return ArrayCollection|MessageAttachment[]
+     * @return Collection|MessageAttachment[]
      */
     public function getAttachments()
     {

src/CoreBundle/Entity/User.php

@@ -2175,7 +2175,7 @@ class User implements UserInterface, EquatableInterface, ResourceInterface, Reso
     public function getSessions(int $relationType): array
     {
         $sessions = [];
-        foreach ($this->sessions as $sessionRelUser) {
+        foreach ($this->getSessionsRelUser() as $sessionRelUser) {
             if ($sessionRelUser->getRelationType() === $relationType) {
                 $sessions[] = $sessionRelUser->getSession();
             }