minor #16143 [Serializer] Fix grammar issue (sebpacz)

This PR was merged into the 5.3 branch.

Discussion
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[Serializer] Fix grammar issue

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Commits
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32278d4 [Serializer] Fix grammar issue

Author: javiereguiluz

components/serializer.rst

@@ -872,7 +872,7 @@ The Serializer component provides several built-in normalizers:
     This normalizer works with classes that implement
     :class:`Symfony\\Component\\Form\\FormInterface`.
 
-    It will get errors from the form and normalize them into an normalized array.
+    It will get errors from the form and normalize them into a normalized array.
 
 :class:`Symfony\\Component\\Serializer\\Normalizer\\ConstraintViolationListNormalizer`
     This normalizer converts objects that implement