metropolis/node: fix api-server metrics docs

Change-Id: I28b4860a11a1fb4beb49feb65317220fcb683efd
Reviewed-on: https://review.monogon.dev/c/monogon/+/2340
Reviewed-by: Lorenz Brun <lorenz@monogon.tech>
Tested-by: Jenkins CI
diff --git a/metropolis/node/ports.go b/metropolis/node/ports.go
index 9907280..f5f845a 100644
--- a/metropolis/node/ports.go
+++ b/metropolis/node/ports.go
@@ -59,8 +59,8 @@
 	// proxy for the controller-manager runs, bound to 127.0.0.1. The metrics
 	// service proxies traffic to it from the public MetricsPort.
 	MetricsKubeControllerManagerListenerPort Port = 7844
-	// MetricsKubeControllerManagerListenerPort is the TCP port on which the
-	// proxy for the controller-manager runs, bound to 127.0.0.1. The metrics
+	// MetricsKubeAPIServerListenerPort is the TCP port on which the
+	// proxy for the api-server runs, bound to 127.0.0.1. The metrics
 	// service proxies traffic to it from the public MetricsPort.
 	MetricsKubeAPIServerListenerPort Port = 7845
 	// KubernetesAPIPort is the TCP port on which the Kubernetes API is