Fix ignored_namespaces configuration and revert FooExtractor filepath

- Use regex pattern format for ignored_namespaces: '/^Acme\\\\/'
- Revert FooExtractor filepath back to src/Acme/DemoBundle/Translation/FooExtractor.php
  since Acme namespace is now properly ignored

Author: OskarStark

.doctor-rst.yaml

@@ -25,8 +25,8 @@ rules:
         namespace_mapping:
             'src/': 'App\'
             'tests/': 'App\Tests\'
-        ignore_namespaces:
-            - 'Acme\'
+        ignored_namespaces:
+            - '/^Acme\\\\/'
         ignored_paths:
             - '/^config\//'
             - '/^example\.com\//'

reference/dic_tags.rst

@@ -1101,7 +1101,7 @@ You can create your own extractor by creating a class that implements
 and tagging the service with ``translation.extractor``. The tag has one
 required option: ``alias``, which defines the name of the extractor::
 
-    // src/DemoBundle/Translation/FooExtractor.php
+    // src/Acme/DemoBundle/Translation/FooExtractor.php
     namespace Acme\DemoBundle\Translation;
 
     use Symfony\Component\Translation\Extractor\ExtractorInterface;