Merge branch '3.4' into 4.3

OskarStark · OskarStark · commit 8b02403764f7 · 2019-08-06T10:39:23.000+02:00
* 3.4:
  Fix custom logging formatter
diff --git a/logging/formatter.rst b/logging/formatter.rst
@@ -19,7 +19,7 @@ configure your handler to use it:
                 file:
                     type: stream
                     level: debug
-                    formatter: '@monolog.formatter.json'
+                    formatter: 'monolog.formatter.json'
 
     .. code-block:: xml
 
