Deprecating support for legacy templates directory

Author: yceruto

reference/configuration/twig.rst

@@ -256,6 +256,10 @@ The default directory where Symfony will look for Twig templates.
 paths
 ~~~~~
 
+.. versionadded:: 4.2
+    The templates directory ``src/Resources/views/`` was deprecated in Symfony 4.2,
+    use the directory defined in the ``default_path`` option (``templates/`` by default).
+
 **type**: ``array`` **default**: ``null``
 
 This option defines the directories where Symfony will look for Twig templates