[JsonStreamer] Fix documentation link in README

Author: jmsche

README.md

@@ -11,7 +11,7 @@ are not covered by Symfony's
 Resources
 ---------
 
- * [Documentation](https://symfony.com/doc/current/components/ser-des.html)
+ * [Documentation](https://symfony.com/doc/current/serializer/streaming_json.html)
  * [Contributing](https://symfony.com/doc/current/contributing/index.html)
  * [Report issues](https://github.com/symfony/symfony/issues) and
    [send Pull Requests](https://github.com/symfony/symfony/pulls)