Merge branch '2.8' into 3.4

* 2.8:
  [php_cs] disable fopen_flags
  [CS] Remove unused variables passed to closures
  [CS] Remove empty comment
  [CS] Enforces null type hint on last position in phpDocs
  [CS] Use combined assignment operators when possible
  Fix a typo in error messages
  [Console] Add missing null to input values allowed types
  [PHPUnitBridge] Fix microtime() format
  bumped Symfony version to 2.8.47
  update CONTRIBUTORS for 2.8.46
  updated VERSION for 2.8.46
  updated CHANGELOG for 2.8.46

Author: nicolas-grekas

Crawler.php

@@ -129,7 +129,7 @@ public function add($node)
      * HTTP 1.1 specification.
      *
      * @param string      $content A string to parse as HTML/XML
-     * @param null|string $type    The content type of the string
+     * @param string|null $type    The content type of the string
      */
     public function addContent($content, $type = null)
     {