Merge branch '2.8' into 3.4

* 2.8:
  [Form] Fix PHPDoc for FormConfigBuilder $dataClass argument
  [Security] Update user phpdoc on tokens
  [WebProfilerBundle] Fixed icon alignment issue using Bootstrap 4.1.2
  suppress side effects in 'get' or 'has' methods of NamespacedAttributeBag
  [HttpFoundation] reset callback on StreamedResponse when setNotModified() is called
  [HttpFoundation] Fixed phpdoc for get method of HeaderBag
  fix typo in ContainerBuilder docblock

Author: fabpot

Authentication/Token/AbstractToken.php

@@ -77,14 +77,7 @@ public function getUser()
     }
 
     /**
-     * Sets the user in the token.
-     *
-     * The user can be a UserInterface instance, or an object implementing
-     * a __toString method or the username as a regular string.
-     *
-     * @param string|object $user The user
-     *
-     * @throws \InvalidArgumentException
+     * {@inheritdoc}
      */
     public function setUser($user)
     {

Authentication/Token/TokenInterface.php

@@ -47,17 +47,22 @@ public function getCredentials();
     /**
      * Returns a user representation.
      *
-     * @return mixed Can be a UserInterface instance, an object implementing a __toString method,
-     *               or the username as a regular string
+     * @return string|object Can be a UserInterface instance, an object implementing a __toString method,
+     *                       or the username as a regular string
      *
      * @see AbstractToken::setUser()
      */
     public function getUser();
 
     /**
-     * Sets a user.
+     * Sets the user in the token.
      *
-     * @param mixed $user
+     * The user can be a UserInterface instance, or an object implementing
+     * a __toString method or the username as a regular string.
+     *
+     * @param string|object $user The user
+     *
+     * @throws \InvalidArgumentException
      */
     public function setUser($user);