Merge branch '5.1' into 5.x

* 5.1:
  Remove simple quotes in config/routes/annotations.yaml

Author: OskarStark

routing.rst

@@ -47,7 +47,7 @@ This command also creates the following configuration file:
 
     # config/routes/annotations.yaml
     controllers:
-        resource: '../../src/Controller/'
+        resource: ../../src/Controller/
         type: annotation
 
     kernel: