Add the versionadded directive

Author: javiereguiluz

reference/configuration/framework.rst

@@ -1300,9 +1300,13 @@ collect_serializer_data
 
 **type**: ``boolean`` **default**: ``false``
 
-This option enables the serializer data collector and profiler panel. If set
-to ``true``, all normalizers and encoders are decorated by traceable implementations
-that are meant to collect profiling information about them.
+Set this option to ``true`` to enable the serializer data collector and its
+profiler panel. When this option is ``true``, all normalizers and encoders are
+decorated by traceable implementations that collect profiling information about them.
+
+.. versionadded:: 6.1
+
+    The ``collect_serializer_data`` option was introduced in Symfony 6.1.
 
 rate_limiter
 ~~~~~~~~~~~~