Fix comment.

cmd/outline-ss-server/metrics.go

@@ -114,7 +114,7 @@ func (c *tunnelTimeCollector) Collect(ch chan<- prometheus.Metric) {
 			delete(c.activeClients, ipKey)
 			continue
 		}
-		// Reset the start time now that it's been reported.
+		// Reset the timing components now that TunnelTime has been reported.
 		client.startTime = tNow
 		client.connDuration = 0
 	}