Fix namespace/filepath mismatches found by DOCtor-RST

- Fix BlogPostReviewSubscriber filepath from src/App/EventSubscriber to src/EventSubscriber
- Fix BlogPostPublishSubscriber filepath from src/App/EventSubscriber to src/EventSubscriber
- Fix Foo namespace from Foo to App\Foo to match src/Foo filepath
- Fix WorkflowLoggerSubscriber filepath from src/App/EventSubscriber to src/EventSubscriber
- Fix AcmeHelloExtension filepath from src/Acme/HelloBundle/DependencyInjection to src/DependencyInjection

Author: OskarStark

bundles/prepend_extension.rst

@@ -20,7 +20,7 @@ on another bundle being loaded as well.
 To give an Extension the power to do this, it needs to implement
 :class:`Symfony\\Component\\DependencyInjection\\Extension\\PrependExtensionInterface`::
 
-    // src/Acme/HelloBundle/DependencyInjection/AcmeHelloExtension.php
+    // src/DependencyInjection/AcmeHelloExtension.php
     namespace Acme\HelloBundle\DependencyInjection;
 
     use Symfony\Component\DependencyInjection\ContainerBuilder;

contributing/documentation/standards.rst

@@ -101,7 +101,7 @@ Example
 .. code-block:: php
 
     // src/Foo/Bar.php
-    namespace Foo;
+    namespace App\Foo;
 
     use Acme\Demo\Cat;
     // ...

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;
@@ -666,7 +666,7 @@ list of the guard event names.
 This example stops any blog post being transitioned to "reviewed" if it is
 missing a title::
 
-    // src/App/EventSubscriber/BlogPostReviewSubscriber.php
+    // src/EventSubscriber/BlogPostReviewSubscriber.php
     namespace App\EventSubscriber;
 
     use App\Entity\BlogPost;
@@ -958,7 +958,7 @@ This example has been simplified; in production you may prefer to use the
 :doc:`Translation </translation>` component to manage messages in one
 place::
 
-    // src/App/EventSubscriber/BlogPostPublishSubscriber.php
+    // src/EventSubscriber/BlogPostPublishSubscriber.php
     namespace App\EventSubscriber;
 
     use Symfony\Component\EventDispatcher\EventSubscriberInterface;