Wrong number in Graceful Shutdown chapter

[lzysuqianqiu]

https://docs.spring.io/spring-boot/reference/web/graceful-shutdown.html this page says "Graceful shutdown is enabled by default with all four embedded web servers (Jetty, Reactor Netty, and Tomcat) ",but should be three embedded web servers

[snicoll]

thanks for the report, this is due to to removal of Undertow.