Remove documentation that's no longer applicable

spring-boot-project/spring-boot-docs/src/main/asciidoc/production-ready-features.adoc

@@ -1488,24 +1488,6 @@ services use self-signed certificates, you need to set the following property:
 
 
 
-[[production-ready-cloudfoundry-custom-security]]
-=== Custom Security Configuration
-If you define custom security configuration and you want extended Cloud Foundry actuator
-support, you should ensure that `/cloudfoundryapplication/**` paths are open. Without a
-direct open route, your Cloud Foundry application manager is not able to obtain endpoint
-data.
-
-For Spring Security, you typically include something like
-`mvcMatchers("/cloudfoundryapplication/**").permitAll()` in your configuration, as shown
-in the following example:
-
-[source,java,indent=0]
-----
-include::{code-examples}/cloudfoundry/CloudFoundryIgnorePathsExample.java[tag=security]
-----
-
-
-
 === Custom context path
 
 If the server's context-path has been configured to anything other then `/`, the Cloud Foundry endpoints

spring-boot-project/spring-boot-docs/src/main/java/org/springframework/boot/docs/cloudfoundry/CloudFoundryIgnorePathsExample.java

-/*
- * Copyright 2012-2018 the original author or authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.springframework.boot.docs.cloudfoundry;
-
-import org.springframework.context.annotation.Configuration;
-import org.springframework.security.config.annotation.web.builders.HttpSecurity;
-import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
-
-/**
- * Example for custom Cloud Foundry actuator ignored paths.
- *
- * @author Phillip Webb
- */
-public class CloudFoundryIgnorePathsExample {
-
-	@Configuration
-	static class CustomSecurityConfiguration extends WebSecurityConfigurerAdapter {
-
-		// @formatter:off
-		// tag::security[]
-		@Override
-		protected void configure(HttpSecurity http) throws Exception {
-			http
-				.authorizeRequests()
-					.mvcMatchers("/cloudfoundryapplication/**")
-						.permitAll()
-					.mvcMatchers("/mypath")
-						.hasAnyRole("SUPERUSER")
-					.anyRequest()
-						.authenticated().and()
-				.httpBasic();
-		}
-		// end::security[]
-		// @formatter:on
-
-	}
-
-}