Incorrect Javadoc regarding default Tomcat async request timeout

[adammichalik]

Follow-up on spring-projects/spring-framework#24030

In org.springframework.boot.autoconfigure.web.servlet.WebMvcProperties.Async#requestTimeout the Javadoc says

/**
 * Amount of time before asynchronous request handling times out. If this value is
 * not set, the default timeout of the underlying implementation is used, e.g. 10
 * seconds on Tomcat with Servlet 3.
 */

However, actually the default timeout in Tomcat is 30 seconds as noted in this comment: https://github.com/apache/tomcat/blob/master/java/org/apache/catalina/core/AsyncContextImpl.java#L74 and indeed set to the default 30000 ms here: https://github.com/apache/tomcat/blob/master/java/org/apache/catalina/connector/Connector.java#L134

The incorrect explicit values were removed from Spring WebMvc Javadocs and so should the Javadoc in Spring Boot.

[wilkinsona]

Thanks, @adammichalik. For further reference, if you intended to open a pull request, there's no need for an issue as well.