Merge branch '3.4' into 4.1

* 3.4:
  Use the real image URL for the filesystem tests
  [Finder] Update PHPdoc append()
  [DI] Fix phpdoc
  Fix code examples in PHPDoc
  [HttpKernel] Fix inheritdocs
  bumped Symfony version to 3.4.16
  updated VERSION for 3.4.15
  updated CHANGELOG for 3.4.15

Author: sroze

Crawler.php

@@ -626,7 +626,7 @@ public function evaluate($xpath)
      *
      * Example:
      *
-     * $crawler->filter('h1 a')->extract(array('_text', 'href'));
+     *     $crawler->filter('h1 a')->extract(array('_text', 'href'));
      *
      * @param array $attributes An array of attributes
      *
@@ -885,7 +885,7 @@ public function registerNamespace($prefix, $namespace)
      * Escaped characters are: quotes (") and apostrophe (').
      *
      *  Examples:
-     *  <code>
+     *
      *     echo Crawler::xpathLiteral('foo " bar');
      *     //prints 'foo " bar'
      *
@@ -894,7 +894,7 @@ public function registerNamespace($prefix, $namespace)
      *
      *     echo Crawler::xpathLiteral('a\'b"c');
      *     //prints concat('a', "'", 'b"c')
-     *  </code>
+     *
      *
      * @param string $s String to be escaped
      *

FormFieldRegistry.php

@@ -186,9 +186,7 @@ private function walk(array $array, $base = '', array &$output = array())
     /**
      * Splits a field name into segments as a web browser would do.
      *
-     * <code>
      *     getSegments('base[foo][3][]') = array('base', 'foo, '3', '');
-     * </code>
      *
      * @param string $name The name of the field
      *