Add docs wrt to configuration of secure actuator endpoints

Author: markpollack

spring-cloud-dataflow-docs/src/main/asciidoc/streams.adoc

@@ -189,6 +189,10 @@ The following table lists the bit.ly links to the available Stream Application S
 
 The following table lists the bit.ly links to the available Stream Application Starters based on Spring Boot 2.0.x:
 
+NOTE: App Starter actuator endpoints are secured by default.  You can disable security by deploying streams with the property `app.*.spring.autoconfigure.exclude=org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration`.  On Kubernetes refer to the section https://docs.spring.io/spring-cloud-dataflow-server-kubernetes/docs/current/reference/htmlsingle/#_liveness_and_readiness_probes[Liveness and readiness probes] to configure security for actuator endpoints.
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 |Artifact Type |Stable Release |SNAPSHOT Release