Minor - format code, remove unused code, fix typo.

public/main/inc/lib/sessionmanager.lib.php

@@ -9627,7 +9627,7 @@ class SessionManager
 
         $em = Database::getManager();
 
-        $relationInfo = array_merge(['visiblity' => 0, 'status' => Session::STUDENT], $relationInfo);
+        $relationInfo = array_merge(['visibility' => 0, 'status' => Session::STUDENT], $relationInfo);
 
         foreach ($studentIds as $studentId) {
             $user = api_get_user_entity($studentId);

src/CoreBundle/Entity/Session.php

@@ -888,6 +888,7 @@ class Session implements ResourceWithAccessUrlInterface
     /**
      * Add a user course subscription.
      * If user status in session is student, then increase number of course users.
+     * Status example: Session::STUDENT
      */
     public function addUserInCourse(int $status, User $user, Course $course): SessionRelCourseRelUser
     {

src/CoreBundle/Repository/SessionRepository.php

@@ -21,8 +21,6 @@ use Doctrine\Persistence\ManagerRegistry;
 use Exception;
 
 /**
- * SessionRepository.
- *
  * @author Julio Montoya <gugli100@gmail.com>
  */
 class SessionRepository extends ServiceEntityRepository