bug #6552 Typo fix in the Serializer deserialization example for existing object (fre5h)

This PR was merged into the 2.7 branch.

Discussion
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Typo fix in the Serializer deserialization example for existing object

| Q              | A
| ------------- | ---
| Doc fix?          | yes
| New docs?     | no
| Applies to       | 2.7+
| Fixed tickets   | N/A

Just found a small typo in the comment with result values of deserialization. As the init value of the `age` of the `person` is 99, then after deserializing the existing `person` object it is 69. But in comment it is still 99 `// $jsonContent contains {"name":"foo","age":99,"sportsman":false}`

Commits
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44ecd19 Typo fix in the Serializer deserialization example

Author: wouterj

components/serializer.rst

@@ -169,7 +169,7 @@ The serializer can also be used to update an existing object::
     EOF;
 
     $serializer->deserialize($data, 'Acme\Person', 'xml', array('object_to_populate' => $person));
-    // $obj2 = Acme\Person(name: 'foo', age: '99', sportsman: true)
+    // $obj2 = Acme\Person(name: 'foo', age: '69', sportsman: true)
 
 This is a common need when working with an ORM.