Merge branch '3.4'

* 3.4:
  [3.4] Remove useless docblocks
  [3.3] More docblock fixes
  [2.7] More docblock fixes
  [TwigBridge] Fix BC break due required twig environment
  Random fixes
  Docblock fixes
  [DI] Fix cannot bind env var
  Fix some signatures in PHP-DSLs
  [HttpKernel] Enhance deprecation message
  bumped Symfony version to 3.4.0
  updated VERSION for 3.4.0-BETA3
  updated CHANGELOG for 3.4.0-BETA3
  [SecurityBundle] Fix the datacollector to properly support decision.object being null

Cookie.php

@@ -80,10 +80,6 @@ public function __construct($name, $value, $expires = null, $path = null, $domai
 
     /**
      * Returns the HTTP representation of the Cookie.
-     *
-     * @return string The HTTP representation of the Cookie
-     *
-     * @throws \UnexpectedValueException
      */
     public function __toString()
     {