Merge branch '5.1' into 5.x

* 5.1:
  update PHP callable docs link

Author: javiereguiluz

components/event_dispatcher.rst

@@ -524,4 +524,4 @@ Learn More
 .. _Mediator: https://en.wikipedia.org/wiki/Mediator_pattern
 .. _Observer: https://en.wikipedia.org/wiki/Observer_pattern
 .. _Closures: https://www.php.net/manual/en/functions.anonymous.php
-.. _PHP callable: https://www.php.net/manual/en/language.pseudo-types.php#language.types.callback
+.. _PHP callable: https://www.php.net/manual/en/language.types.callable.php