fix(help): improve description for CLI flags

Minor tweak to clarify what the port number corresponds to

Author: jpetazzo

cmd/cache/main.go

@@ -75,7 +75,7 @@ func main() {
 		"Enable leader election for controller manager. "+
 			"Enabling this will ensure there is only one active controller manager.")
 	flag.UintVar(&expiryDelay, "expiry-delay", 30, "The delay in days before deleting an unused CachedImage.")
-	flag.IntVar(&proxyPort, "proxy-port", 8082, "The port where the proxy is listening on this machine.")
+	flag.IntVar(&proxyPort, "proxy-port", 8082, "The port on which the registry proxy accepts connections on each host.")
 	flag.Var(&ignoreImages, "ignore-images", "Regex that represents images to be excluded (this flag can be used multiple times).")
 	flag.Var(&architectures, "arch", "Architecture of image to put in cache (this flag can be used multiple times).")
 	flag.StringVar(&registry.Endpoint, "registry-endpoint", "kube-image-keeper-registry:5000", "The address of the registry where cached images are stored.")