Merge branch '6.1' into 6.2

* 6.1:
  [HttpKernel] Mention the PSR-7 resolver

Author: javiereguiluz

controller/argument_value_resolver.rst

@@ -133,6 +133,12 @@ In addition, some components and official bundles provide other value resolvers:
     user has a user class not matching the type-hinted class, an ``AccessDeniedException``
     is thrown by the resolver to prevent access to the controller.
 
+PSR-7 Objects Resolver:
+    Injects a Symfony HttpFoundation ``Request`` object created from a PSR-7 object
+    of type :class:`Psr\\Http\\Message\\ServerRequestInterface`,
+    :class:`Psr\\Http\\Message\\RequestInterface` or :class:`Psr\\Http\\Message\\MessageInterface`.
+    It requires installing :doc:`the PSR-7 Bridge </components/psr7>`_ component.
+
 Adding a Custom Value Resolver
 ------------------------------