improve changelog message

Signed-off-by: Ahmad Karimi <ak12hastam@gmail.com>

changelogs/unreleased/6523-therealak12-small.md

@@ -1 +1 @@
-Improve response time by utilizing a query param (`filter=http\..*\.downstream_cx_active`) when querying `/stats/prometheus` for `envoy_http_downstream_cx_active` in the shutdown-manager.
+Improve shutdown manager query to the Envoy stats endpoint for active connections by utilizing a regex filter query param.