Merge branch '3.4' into 4.3

* 3.4: (21 commits)
  [SecurityBundle] fix return type declarations
  [BrowserKit] fix return type declarations
  [PropertyInfo] fix return type declarations
  [Bridge/Doctrine] fix return type declarations
  [Form] fix return type declarations
  [Console] fix return type declarations
  [Intl] fix return type declarations
  [Templating] fix return type declarations
  [DomCrawler] fix return type declarations
  [Validator] fix return type declarations
  [Process] fix return type declarations
  [Workflow] fix return type declarations
  [Cache] fix return type declarations
  [Serializer] fix return type declarations
  [Translation] fix return type declarations
  [DI] fix return type declarations
  [Config] fix return type declarations
  [HttpKernel] Fix return type declarations
  [Security] Fix return type declarations
  [Routing] Fix return type declarations
  ...

Author: nicolas-grekas

PropertyPathBuilder.php

@@ -193,7 +193,7 @@ public function getLength()
     /**
      * Returns the current property path.
      *
-     * @return PropertyPathInterface The constructed property path
+     * @return PropertyPathInterface|null The constructed property path
      */
     public function getPropertyPath()
     {

PropertyPathInterface.php

@@ -40,7 +40,7 @@ public function getLength();
      *
      * If this property path only contains one item, null is returned.
      *
-     * @return PropertyPath|null The parent path or null
+     * @return self|null The parent path or null
      */
     public function getParent();