Clarify doc

Add an explicit note about the need of Spring MVC for actuator HTTP
endpoints. Also explicitly mention Jersey since it can be a source of
confusion.

See gh-2025

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

@@ -9,6 +9,8 @@ application using HTTP endpoints, with JMX or even by remote shell (SSH or Telne
 Auditing, health and metrics gathering can be automatically applied to your application.
 --
 
+NOTE: Actuator HTTP endpoints are only available with a Spring MVC-based application. In
+particular, it will not work with Jersey unless you enable Spring MVC as well.
 
 
 [[production-ready-enabling]]