minor symfony#13927 Update serializer.rst (atailouloute)

This PR was merged into the 3.4 branch.

Discussion
----------

Update serializer.rst

Commits
-------

5dcf3e9 Update serializer.rst

Author: javiereguiluz

components/serializer.rst

@@ -942,9 +942,7 @@ Use the special ``#`` key to define the data of a node::
     // is encoded as follows:
     // <?xml version="1.0"?>
     // <response>
-    //     <foo bar="value">
-    //        baz
-    //     </foo>
+    //     <foo bar="value">baz</foo>
     // </response>
 
 Context