simpler check and deps messages

rig/ctrl/addons/metrics-server.sh

@@ -1,10 +1,6 @@
 #!/usr/bin/env bash
-# metrics-server — makes `kubectl top` work.
-#
-# kind nodes serve kubelet metrics over a self-signed cert, so the standard
-# manifest never becomes ready without --kubelet-insecure-tls. That is fine here
-# (it is a local cluster) and is the single most common reason metrics-server
-# sits at 0/1 on kind.
+# metrics-server — makes `kubectl top` work (patched with --kubelet-insecure-tls for kind).
+# Notes: docs/notes/addons.md
 set -euo pipefail
 cd "$(dirname "$0")/.."