Add version added

Author: OskarStark

reference/configuration/framework.rst

@@ -2755,6 +2755,10 @@ to a `json_encode flags bitmask`_.
 You can inspect the :ref:`serializer context builders <serializer-using-context-builders>`
 to discover the available settings.
 
+.. versionadded:: 6.2
+
+    The ``default_context`` parameter was introduced in Symfony 6.2.
+
 php_errors
 ~~~~~~~~~~