minor #9928 Update messenger.rst (walidboughdiri)

This PR was submitted for the 4.1 branch but it was merged into the 4.0 branch instead (closes #9928).

Discussion
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Update messenger.rst

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Commits
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270b306 Update messenger.rst

Author: javiereguiluz

components/messenger.rst

@@ -162,7 +162,7 @@ First, create your receiver::
        private $serializer;
        private $filePath;
 
-       public function __construct(SerializerInteface $serializer, string $filePath)
+       public function __construct(SerializerInterface $serializer, string $filePath)
        {
            $this->serializer = $serializer;
            $this->filePath = $filePath;