renovate: name the nginx alpine check in #84 accurately

The rationale called the alpine switch a proposal from the issue text.
A later comment on #84 commissions it as a check with a defined scope
(nginx.conf compatibility, port 8080, uid 101, /tmp redirection) to be
done alongside the seccompProfile PR for this chart. The outcome is open,
the check is not - the constraint has to survive either way.

renovate.json5

@@ -108,8 +108,9 @@
       matchDatasources: ["docker"],
       matchPackageNames: ["nginx", "library/nginx", "docker.io/library/nginx"],
       // Even minor: any minor whose last digit is even, so 1.30.x passes and
-      // 1.31.x does not. The trailing (-.+)? is load-bearing: #84 proposes
-      // moving this sidecar to a slimmer base image, and with a variant tag
+      // 1.31.x does not. The trailing (-.+)? is load-bearing: #84 commissioned
+      // a check on moving this sidecar to 1.30.4-alpine (outcome open, to be
+      // done alongside the seccompProfile PR), and with a variant tag
       // like 1.30.4-alpine docker versioning only ever offers candidates
       // carrying the same suffix. Without the optional suffix, every one of
       // them would fail this filter and nginx would silently stop receiving