minor #18783 [Serializer] Use correct property types in example (teklakct)

This PR was merged into the 6.4 branch.

Discussion
----------

[Serializer] Use correct property types in example

In the [Selecting Specific Attributes](https://symfony.com/doc/current/components/serializer.html#selecting-specific-attributes) section, there is a type mismatch in the example `User` class.

Commits
-------

2b29113 [Serializer] Use correct property types in example

Author: OskarStark

components/serializer.rst

@@ -401,7 +401,7 @@ It is also possible to serialize only a set of specific attributes::
     {
         public string $familyName;
         public string $givenName;
-        public string $company;
+        public Company $company;
     }
 
     class Company