removes RN from 8.17.9

Author: natasha-moore-elastic

docs/release-notes/8.17.asciidoc

@@ -25,11 +25,6 @@
 [[release-notes-8.17.9]]
 === 8.17.9
 
-[discrete]
-[[enhancements-8.17.9]]
-==== Enhancements
-* Shortens the time it takes to recover from a `DEGRADED` status caused by {elastic-agent} communication issues.
-
 [discrete]
 [[bug-fixes-8.17.9]]
 ==== Fixes