style: drop tracker tags from the collector modules' comments

The pre-push lint refuses them, and rightly: a comment that names an
issue number ages into a pointer at a closed thread. The constraint each
one carried is stated directly instead.

nix/host-modules/otel.nix

@@ -230,7 +230,8 @@
             # hive whose swarm collector lives elsewhere then names it in
             # config instead of needing this file changed. A loopback
             # literal is correct only while listener and caller share a
-            # netns — the assumption that cost #2860 and #3363.
+            # netns, an assumption that has cost this project two
+            # outages.
             endpoint = config.services.hyperhive.swarm.otel.url;
           };