Reference FELIX-6859 for the missing virtual thread pool combination

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

http/README.md

diff --git a/http/README.md b/http/README.md
index e9b5835..2483e7c 100644
--- a/http/README.md
+++ b/http/README.md
@@ -505,7 +505,7 @@
 * Keep `org.apache.felix.http.jetty.selectors` below the number of carrier threads.
 * Jetty documents a third combination as the preferred one: a `QueuedThreadPool` whose virtual
   threads executor is a bounded `VirtualThreadPool`. There is no Felix HTTP configuration for that
-  combination.
+  combination yet, this is tracked in [FELIX-6859](https://issues.apache.org/jira/browse/FELIX-6859).
 
 Virtual threads require JDK 21 or later and are only supported by the Jetty 12 bundle. The Jetty 11
 bundle only honours `org.apache.felix.http.jetty.threadpool.max`.