CsrfDsl does not have a spa() configuration method.

[XhstormR]

Describe the bug
According to the documentation, org.springframework.security.config.annotation.web.CsrfDsl should have a spa() configuration method, but it doesn't.
https://docs.spring.io/spring-security/reference/servlet/exploits/csrf.html#csrf-integration-javascript-spa

To Reproduce

    @Bean
    open fun securityFilterChain(http: HttpSecurity): SecurityFilterChain {
        http {
            // ...
            csrf {
                spa()
            }
        }
        return http.build()
    }

Expected behavior
According to the documentation, CsrfDsl should have a spa() configuration method.