Note that the heapdump endpoint requires a HotSpot JVM

Closes gh-26467

Author: wilkinsona

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

@@ -135,6 +135,7 @@ If your application is a web application (Spring MVC, Spring WebFlux, or Jersey)
 
 | `heapdump`
 | Returns an `hprof` heap dump file.
+  Requires a HotSpot JVM.
 
 | `jolokia`
 | Exposes JMX beans over HTTP (when Jolokia is on the classpath, not available for WebFlux).