Fix namespace/filepath mismatch found by DOCtor-RST

- Fix WorkflowLoggerSubscriber filepath from src/App/EventSubscriber to src/EventSubscriber

Author: OskarStark

workflow.rst

@@ -573,7 +573,7 @@ The context is accessible in all events except for the ``workflow.guard`` events
 Here is an example of how to enable logging for every time a "blog_publishing"
 workflow leaves a place::
 
-    // src/App/EventSubscriber/WorkflowLoggerSubscriber.php
+    // src/EventSubscriber/WorkflowLoggerSubscriber.php
     namespace App\EventSubscriber;
 
     use Psr\Log\LoggerInterface;