Merge branch '3.4'

* 3.4: (33 commits)
  Remove remaining `@experimental` annotations
  Tests and fix for issue in array model data in EntityType field with multiple=true
  [Validator] Add unique entity violation cause
  [Lock] Automaticaly release lock when user forget it
  [Form] Fixed PercentToLocalizedStringTransformer to accept both comma and dot as decimal separator, if possible
  fixed CS
  [FrameworkBundle] Don't clear app pools on cache:clear
  Hide label button when its setted to false
  removed useless PHPDoc
  [HttpFoundation] Return instance in StreamedResponse
  [Form] Fix FormInterface::submit() annotation
  [PHPUnitBridge] don't remove when set to  empty string
  PdoSessionHandler: fix advisory lock for pgsql when session.sid_bits_per_character > 4
  HttpCache does not consider ESI resources in HEAD requests
  Fix translation for "This field was not expected"
  [Routing] Enhance Route(Collection) docblocks
  Added improvement for accuracy in MoneyToLocalizedStringTransformer.
  Removed unused private property
  Use correct verb form in the pull request template
  Use PHP_MAXPATHLEN in Filesystem.
  ...

Author: nicolas-grekas

Mapping/Loader/FileLoader.php

@@ -26,8 +26,6 @@ abstract class FileLoader implements LoaderInterface
     protected $file;
 
     /**
-     * Constructor.
-     *
      * @param string $file The mapping file to load
      *
      * @throws MappingException if the mapping file does not exist or is not readable