minor #10910 Update serializer.rst (atailouloute)

This PR was merged into the 3.4 branch.

Discussion
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Update serializer.rst

Use the same namespace used in class definition

Commits
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8a6e042 Update serializer.rst

Author: javiereguiluz

components/serializer.rst

@@ -189,7 +189,7 @@ when constructing the normalizer::
     $classMetadataFactory = new ClassMetadataFactory(new AnnotationLoader(new AnnotationReader()));
     $normalizer = new ObjectNormalizer($classMetadataFactory);
     $serializer = new Serializer([$normalizer]);
-    $person = $serializer->deserialize($data, 'Acme\Person', 'xml', [
+    $person = $serializer->deserialize($data, 'App\Model\Person', 'xml', [
         'allow_extra_attributes' => false,
     ]);