Merge branch '5.3' into 5.4

* 5.3:
  Complete App\Handler\HandlerCollection namespace
  Update mime.rst

Author: javiereguiluz

components/mime.rst

@@ -238,10 +238,10 @@ MIME types and file name extensions::
     $exts = $mimeTypes->getExtensions('image/jpeg');
     // $exts = ['jpeg', 'jpg', 'jpe']
 
-    $mimeTypes = $mimeTypes->getMimeTypes('js');
-    // $mimeTypes = ['application/javascript', 'application/x-javascript', 'text/javascript']
-    $mimeTypes = $mimeTypes->getMimeTypes('apk');
-    // $mimeTypes = ['application/vnd.android.package-archive']
+    $types = $mimeTypes->getMimeTypes('js');
+    // $types = ['application/javascript', 'application/x-javascript', 'text/javascript']
+    $types = $mimeTypes->getMimeTypes('apk');
+    // $types = ['application/vnd.android.package-archive']
 
 These methods return arrays with one or more elements. The element position
 indicates its priority, so the first returned extension is the preferred one.

service_container/service_subscribers_locators.rst

@@ -485,7 +485,7 @@ of the ``key`` tag attribute (as defined in the ``index_by`` locator option):
                 tags:
                     - { name: 'app.handler', key: 'handler_two' }
 
-            App\HandlerCollection:
+            App\Handler\HandlerCollection:
                 # inject all services tagged with app.handler as first argument
                 arguments: [!tagged_locator { tag: 'app.handler', index_by: 'key' }]